Quadrilaterals - Exercise 8.1 (Question 5 to 8) Solutions | Class 9 Maths Chapter 8

[@MagnetBrainsEducation]

✔️📚👉 Grab Notes by Expert Teachers Here: www.pabbly.com/out/magnet-brains ✔️📚👉Get any subject playlist here:- www.magnetbrains.com/get-subject-wise-playlist ✔️📚👉Get any class & subject's topic Video here:- www.magnetbrains.com/get-topic-wise-video ✔️📚👉 Watch Full Free Course: www.magnetbrains.com

[@tivrasachan6396]

Sir smart board me white colour na laga kr black colour lga dijiya kariye , white colour lagane se aakho me bahut zor padta hai

[@minervadas9211]

Free me padha rahe hai aur kya chahiye

[@kamaljsohi]

@@minervadas9211 🤣🤣

[@KrishanKumar-zp4tz]

@@minervadas9211 bas kar bai

[@Purple_Lily_72]

@@minervadas9211 right😂😂 but isne bhi sahi hi kaha hai 🙄🙄

[@Padhai_sirf_padhai]

Sahi bola bhai

[@Nerd_thisside]

Thank you so much sir. I studied from you and did regular practice that's why I scored 77/80 in my mid-term! Thank you so much !

[@1aliveff811]

I am in class 9 and in 21 Feburary I am going to have my term 3 exam pray for me

[@mohanlalshastri4343]

I scored 70 out of 70

[@garimzz3783]

study tips dedo yaar

[@Abhinav93152]

​@@mohanlalshastri4343jhut

[@drawingmaster7849]

Thank you sir you teaches very nice

[@rajbala8231]

You explain it very nicely😊

[@nuzhatdeva387]

Sir in question 5 you can simply say that " if the diagnols of a quadrilateral bisect each other then it is a parallelogram."

[@culture-ty9rh]

WOW, what a nice explanation👌 I was doing ques.7&8 again & again in my coaching & also myself,but I was not able to understand these 2 questions. After 2 weeks my tests are coming and I'm really very very thankful to magnet brains and sir who helped me in solving these questions.Again tq so much🙏🏻🙏🏻🙏🏻

[@pokebenop]

mine examis in 5 days

[@ayushrathor2271]

I always thought that maths is very difficult but since I started studying from you, maths became my favorite subject.

[@OJASV_]

Really how bro please tell

[@bhavyaanushka4012]

@@OJASV_ Just understand the concept clearly and practice all the examples and questions in TB. Later if time is there, Buy some Question bank and just practice.....Clear Concepts, Basic Foundation + Practice is what makes Math easy....

[@chandnidas2366]

Mobile me padhai kar rhe hai isli

[@talhashaikh2766]

Thank you so much sir for giving us best education Thank you so much sir😇 I also thank to the magnet brains to give us education free of cost

[@vinodkumarsingh9074]

Sir all the doubts are cleared, Thank you for your explanation... 😊

[@MagnetBrainsEducation]

Thank you for watching our videos and taking the time to write a comment! We're glad that our videos were able to help clear up any doubts that you had. :)

[@shaileshupadhyay3201]

Sir ur videos are just amazing👍 hope so that magnet brains will reach 10m soon

[@bhrigumoshal8876]

Sir is it possible that in the Q6 we can prove Angle C is also bisected by angle a because it's a parallelogram and opposite sides are equal in a parallelogram?

[@MagnetBrainsEducation]

Hi there! Great question! Yes, in a parallelogram, the opposite sides are equal, so Angle C is also bisected by Angle A. Thanks for watching our video and taking the time to ask such a great question! We hope you found it helpful.

[@pramilaji8486]

❤❤

[@Sonalikumari-n4j]

Very good 👍 teacher l am also lucky thank-you Very much sir 🙏 👏 👍 Mahadev blessed 🙌 u 😘 🙏

[@Arshi_001]

Thanks sir, Tomorrow is my maths exam and this video helps me a lot 🥰

[@MagnetBrainsEducation]

Thank you so much for watching our video! We're glad that it was able to help you out ahead of your maths exam. Best of luck for your exam!

[@ShivdarshanSingh-i4o]

Wow sir your explanation is amazing 😊❤

[@amarjeetsingh-zh5pp]

Thanks sir for clear our concept

[@rinkubhagyal6066]

Wow. Sir ji kmal ha bilkul smj aa gaye😮😮

[@Aayushi_11_Dwivedi]

True bro

[@MayankPal-c2i]

Thanks sir 🙏🏼🙏🏼🙏🏼🙏🏼🙏🏼🙏🏼🙏🏼🙏🏼🙏🏼🙏🏼

[@ayushrathor2271]

sir i used to always fail in maths earlier but you made me the topper of the class thank you very much sir

[@OJASV_]

How bro please tell me

[@JatinParashar29]

19:40 they are also known as co-interior angles

[@MagnetBrainsEducation]

Thank you for your comment! We are glad our videos are helping you with your school studies. We hope to continue to provide educational resources to help students learn and grow.

[@shaluu-1235]

Thank uu sir😊🤩 ur really a best,teacher ever😇

[@MagnetBrainsEducation]

Thank you so much for your kind words! We're so happy you're enjoying the videos and that they're helping you out. Keep up the great work and we hope you have a great day!

[@khyati-nu5qt]

In question number 8, you demonstrated that all four sides are equal, which means the shape is a square. However, a rhombus also has this property. Is it necessary to provide additional proof to clarify that it is a square?

[@Steelmax-zu5hz]

Here also given that each angle 90° as it was a rectangle ❤

[@ramvijayyadav763]

Sir your explanation is very good when I see your videos my doubts become clear I always see your videos and tomorrow is my exam and I am continuously watching thanks a lot magnet brains it is the best free education platform

[@ankitasingh3002]

Your explanation is too good sir my all concept geeting clear by seeing your videos🌝

[@MagnetBrainsEducation]

Thanks for watching our videos! We're so glad that you found them helpful in understanding the concepts. We hope you continue to learn more from our videos and that it aids your studies.

[@induupadhyay6617]

Thank you sooooooooooo much sir 😇for giving this knowledge

[@gaming1359]

This is very helpful video sir

[@MagnetBrainsEducation]

Thank you so much for your positive comment! We hope that our educational videos can help you to learn more and understand the concepts better. If you ever need help with any other topics, feel free to reach out to us. We'd be glad to help.

[@anitashukla1180]

You're the best ! 🙌

[@mananyadav5850]

you are great sir nice 👍

[@MagnetBrainsEducation]

Thank you! We're glad you like our videos. :)

[@triptideeptipandey3073]

You are amazing sir 🤩 I understand every question

[@MagnetBrainsEducation]

Thank you! We're glad you're enjoying the videos!

[@ramniwas2689]

Gjb

[@SauravMaurya-f8j]

Sir please taught me I am very weak in maths

[@PlayStore-qx1eo]

You are the best teacher of maths❤❤❤❤❤❤❤❤

[@MagnetBrainsEducation]

Thank you so much for your kind words! We're so happy to hear that our videos are helping you out. Keep up the good work and we'll keep making great content for you to learn from!

[@Esha118]

Sir q 6 mai rhombus prove krne k liye ∆ABC congurent ∆ CDA kr ke charo side equal krr skte 😢😢😢

[@MagnetBrainsEducation]

Thank you so much for your comment! We're glad you're enjoying our videos and finding them helpful. We hope you'll keep watching and that you'll continue to learn and grow with us. Thank you for your support!

[@Esha118]

​@@MagnetBrainsEducation🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️🤦‍♀️

[@Rules_Breaker2657]

Lakin sir question 5 mein hum figure ko parallelogram na proof kr ke sidha square bhi to proof kr sakte the triangle AOB and triangle COD aur triangle DOA and triangle COB ko congruent proof kr ke by CPCT charo sides to equal proof kr dete ye square ki hi to property hai na ki usme charo sides equal hoti hai

[@MagnetBrainsEducation]

Great job on thinking outside the box! You are absolutely correct that a square is a parallelogram with all sides equal. However, proving that the four triangles in the figure are congruent is enough to show that the figure is a square. Keep up the good work!

[@Rules_Breaker2657]

Thankyou very much for reply

[@arceusthegod2704]

@@MagnetBrainsEducation how?

[@arceusthegod2704]

@@Rules_Breaker2657 how?

[@VinodYadav-go1tf]

Wow sir ☺️❤️ amazing explanation thank your magnet brains 🤗

[@MagnetBrainsEducation]

Wow! Great to know that you like our explanation. Do check out our other videos too. We have a complete playlist of all our videos here - [LINK].

[@slChoudhary-if4dw]

Sir good solving the

[@Navdeep_neet26]

Thanks so much sir 😊

[@MagnetBrainsEducation]

Thank you for watching our videos! We're glad you're enjoying them. Keep up the good work!

[@rajeshsolanki9334]

Sir ve love u

[@geetanjalimaravi1117]

Sir jo given hai vo bhi proof karna hai aur jo prove karna hai vo bhi ?

[@MagnetBrainsEducation]

Thank you for your comment! We are glad to hear that you are finding our videos helpful. We understand your query regarding proof and we suggest you to go through the video once again as our videos are created in such a way that it provides step-by-step guidance. We are sure it will help you in understanding the concept better.

[@khanmehak9680]

NiCe....👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻

[@MagnetBrainsEducation]

Thank you for your positive feedback! We are glad that our videos are helping you learn something new. If there's anything else we can do to help you, don't hesitate to reach out.

[@sangeetakumar6108]

56:41

[@virendyadav7455]

You are a god for students sir

[@Ash0001-p7f]

sir kya q.8 mein hum aise bhi prove kr skte hai kya ki angle d = angle b by alt.interior angle kya hum aise kar sakte hain kya

[@bimanbiswas4941]

Sir ji triangle AOB aur triangle BOC ko hum SAS congruence rule se direct bhi toh prove kar sakte hau

[@combater3209]

20:08 AD is transversal sir ne likha jab ki AB is Transversal rahega

[@MagnetBrainsEducation]

Thank you for your comment! We're glad you found our video helpful. We hope you continue to use our videos as a resource in your studies.

[@idseller482]

Thank you sir i bacome the topper of my class when I start watching your videos 😍

[@MagnetBrainsEducation]

Thank you so much for your kind words! We're glad our videos have been helpful in your success. Congratulations on becoming the top student in your class! We hope you'll continue to use our videos to help you excel in your studies.

[@akshatop8720]

😂

[@seriousmatter3280]

Thanks for your support

[@JayGupta2508]

Thankyou so much sir tomorrow is my maths exam this video help me a lot

[@gloss4792]

Best thing in this chapter is cpct!

[@anshikakamboj2091]

Watching this one day before exam😂😊hoping that I'll score good

[@AmritVlogs900]

Sir,Your explanation is good

[@Navdeep_neet26]

19:25 sir here transversal is not AD . sir here transversal is AB☺️

[@MagnetBrainsEducation]

Thank you for pointing out the mistake. Our team will look into it and make the necessary changes. We appreciate your feedback and hope you continue to watch our videos.

[@mjhere4600]

Tomorrow is my final exam you helped me a lot sir 🙏

[@studywithdaksh1663]

I love you 💞 sir

[@MagnetBrainsEducation]

Thank you for your kind words, we're happy to hear that you're enjoying our videos!

[@alitahira7677]

At 4:32 Where is right angle in the figure

[@MagnetBrainsEducation]

It's great that you're paying attention to the details in the video! The right angle is at the bottom left corner of the figure.

[@itz_pappu6899]

Sir congruence proof karne ke liye koi bhi triangle le sakte hai ya jo aap video me bataye hai vahi lena padega.

[@vandanagupta475]

It's your choice

[@YeshKashyap-x9b]

Aap aapni marji se le sakta ho

[@pratyushpanalkar1260]

Sir 😊 pls write short

[@RiyaSingh-gj8gl]

Nice sir 👍

[@MagnetBrainsEducation]

Thank you for your kind words! We are glad that you are finding our educational videos helpful. Feel free to comment on other videos for any queries and we will be happy to help!

[@tabassumnisar3799]

Sir q no. 6 me congrurnt kr ke bhi to angle equal kr skte h

[@nagalakahminl5888]

In q6 by using theorem 8.4 when can say that opp angles are equal and as their opp angles are equal , ABCD is a rhombus

[@Sarthakkaushik983]

wrong

[@nagalakahminl5888]

@@Sarthakkaushik983 ok bro thanks

[@AbhishekSingh-ub7sk]

6:15

[@MagnetBrainsEducation]

Abhishek Singh, Thank you for your comment. Do recommend Magnet Brains to your friends. Get All Classes & Subject Wise playlists here:- ​www.pabbly.com/out/all-videos-playlist

[@AbhinavSingh-ju9cb]

Nice 👏👏👍👍👏👏👍👍👏👏👍👍

[@MagnetBrainsEducation]

Thank you for your appreciation! We are so glad that you find our educational videos helpful. We always strive to provide quality content to our students and we hope to keep doing so in the future.

[@infinitytechnologyrewa2636]

Sir bahut matlab acha

[@MagnetBrainsEducation]

Thank you for watching our educational videos! We're glad you found them helpful in your studies.

[@vilasdewal1534]

I know that you want every child to understand proper but please can you make some short video you make 10 to 11 videos on particular chapter

[@Max_steel70]

And you have improved your website interface

[@MagnetBrainsEducation]

Thank you for your feedback! We are always looking for ways to improve the user experience and are happy to hear that you noticed our latest changes. We hope that our educational videos continue to be helpful to you in your studies!

[@mvpian45]

Thanks sir it helps me in my exams ☺😊

[@arceusthegod2704]

Sir there AB is the transversal, you told also but written AD as transversal

[@PlayStore-qx1eo]

Yeah

[@arceusthegod2704]

Hm

[@shine_sparkle893]

Sir in 5Th question triangle AOB and triangle COD kya vo SAS Se vo equal hoga kya?

[@devanshtiwari-mk3mk]

Rhendo tum bts world ho

[@Vaibhavi_tiwari_2010]

Wow 🤩🤩🤩 super explanation 😮😮thank you sir 🥲😍😍

[@Sonikeshri781]

How you are able to upload such content to us without any money ? I could not understand..

[@Aayushi_11_Dwivedi]

Nice question dude 😂

[@Aayushi_11_Dwivedi]

Nice question dude 😂

[@gaming1359]

Sir sorry for saying that but in question number 5 AD is not a transversal AB is a transverse

[@MagnetBrainsEducation]

Thanks for your feedback! We really appreciate it. We've taken note of your comment and will make sure to double check the answer for question 5 in future videos. We hope you continue to find our videos helpful in your studies.

[@deepikadhoundeiyal3408]

Thanku sir ...

[@MagnetBrainsEducation]

Thank you for your kind words. We are glad that our videos are helpful in your studies. Please feel free to reach out to us if you have any questions or need any further assistance.

[@SatishKumar-ut4cn]

Interior angle on same side of transversal ko hum co interior angle bol sakte h

[@MagnetBrainsEducation]

Thank you for your comment! You are absolutely right, we can call them co-interior angles!

[@SatishKumar-ut4cn]

Thanks sir

[@Esha118]

Ek or doubt question 5 k last mai appne AB=CB by sas so we can say, similarly DC = DA or dono k milakar AB = CB = DC = DA 😢😢😢😢😢

[@MagnetBrainsEducation]

Thank you for your comment! We're glad you're enjoying our videos and finding them helpful. We appreciate your feedback and hope you continue to enjoy our videos!

[@Smart_09-k7n]

Thanku sir! ❤️

[@MagnetBrainsEducation]

Thank you! We're so glad you're enjoying the videos :)

[@futureDoctor944]

Ty sir for teaching

[@ranbirpoonia1696]

Nice explanation sir

[@kavitagoswami2906]

Sir kya square or rectangle same h kya 🤔

[@MagnetBrainsEducation]

In mathematics, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree angles, or right angles). A rectangle is a quadrilateral with two sets of parallel sides. So, all rectangles are quadrilaterals,

[@siddharthplay8384]

Que 5 AB is a transversal at AD ll CB

[@MagnetBrainsEducation]

Thank you for watching our educational videos and for taking the time to write a comment! We're glad you found the videos helpful and we hope you continue to use them as a resource in your studies.

[@ubaidabinttahirali6201]

Sir kya ham kisi bi side to koi bi angle de sakte hai

[@bharathiabt4440]

Thanku

[@MagnetBrainsEducation]

You're welcome! We're so glad that you appreciate our videos and we hope that you learn a lot from them. Enjoy the lessons!

[@shrutiscreativeideas2803]

Sir I have a doubt ! In question no 6 - (2) show that ABCD is a rhombus , you have said that all four sides are equal but in square also all four sides are equal then how can you say it is a rhombus ?

[@shrutiscreativeideas2803]

Can I use one more property of rhombus than diagonal are not equal if we can then how?

[@MagnetBrainsEducation]

Thank you for your comment and question! You are absolutely right that in a square all four sides are equal. However, in a rhombus, not only are all four sides equal, but all four angles are also equal. So a rhombus is a four-sided figure in which all sides are equal and all angles are equal.

[@jokerff750]

Sir pls make video lil small😢

[@parmjeetanand-u2k]

Aap itna dhire bolte ho mein 2x mein bhi araam se sunn leta hu 😂

[@LifeFact425]

Right I am also

[@Aayushi_11_Dwivedi]

Me too bro 😂

[@rajthakurbhai9472]

Class 9th ka science gravitational video bhejiye

[@Zayan773]

Sir can you please not use a white background board? Use a black background or dark mode

[@Aayushi_11_Dwivedi]

True bro

[@prajapatinaresh6548]

Nice

[@MagnetBrainsEducation]

Thanks for the kind words! We're glad you're enjoying our educational videos. We hope they help you with your studies. Let us know if there's anything else we can do to help.

[@swarsangam4058]

But sir hum question 5 mein dirct square bhi proof krste h na without parallelogram proof kre????

[@MagnetBrainsEducation]

Thank you for your comment! We appreciate that you are watching our videos and trying to understand the concepts. For question 5, you can indeed prove it using the properties of a rectangle, but feel free to use the parallelogram proof as well. Thank you again for watching and we hope our

[@viraljain587]

Sir sirf sare sides equal kar ke prove kar sakte ha ki yah square ha 26:40

[@MagnetBrainsEducation]

Hi there! Great question! You can prove that the shape is a square by showing that all the sides are equal and all the angles are equal. Check out this link for a full explanation . Keep up the great work! :)

[@SunilRathod-wl7wo]

Question 5 Ac transversal

[@army_forever.4864]

Sir please explain chapter 14 of rd sharma

[@MagnetBrainsEducation]

Thanks for watching our video! We're glad you're finding them helpful. Please keep watching and let us know if you have any other questions.

[@viraljain587]

Sir question 7 me congruency karke prove kar sakte h

[@MagnetBrainsEducation]

Thanks for your comment! Yes, you can prove congruency in question 7 by using the definition of congruency. If you need extra help, please feel free to check out our other free educational videos for further assistance. Thanks for watching!

[@anjummalik534]

Aap bhoot acha padhate ho

[@darelalgajbhiye5265]

Good afternoon sir

[@swarsangam4058]

Sir question 5 mein triangle DAB and triangle CBA ko proof krke CPCt se angle A and angle B ko proof krne ke bdd apne transversal AD btaya h but I think transversal AD hona chahiye I am confused here please tell me what is the transversal here?

[@MagnetBrainsEducation]

Thank you so much for taking the time to watch our educational videos! We really appreciate it. In regards to your question, the transversal AD is correct. We apologize for any confusion. Thank you again for watching and we hope you continue to do so!

[@skyupshorts09]

Sir try to take less time in a question

[@sachingajraj3580]

Nice sir

[@Editingedition1]

Can angle c is equal to angle a in 6th q

[@DAfton83]

Inka explain karne ka tarika badiya h

[@Esha118]

Theorem ka numbers likhna jaroori hai I mean by theorem 8.1 by theorem 8.2 agar nii likhenge toh chalega 😢😢😢

[@MagnetBrainsEducation]

Thank you for your comment! We're glad you're enjoying our videos. Theorems are an important part of any math education, and we're happy to help you learn them. Keep up the good work!

[@Esha118]

@@MagnetBrainsEducation oohoo 😦🤦‍♀️🤦‍♀️🤦‍♀️

[@ANURAGSINGH-bd6kj]

Sir in question 6 where is the fourth side that you proof AB =BC CD= AB BC= AD Where is the fourth one ??

[@MagnetBrainsEducation]

Thank you for writing in! In question 6, the fourth side that we prove is AD = CD.

[@RekhaSharma-mt3uh]

Sir please make video on 8.2

[@MagnetBrainsEducation]

Thanks for your suggestion! We will definitely consider making a video on 8.2 to add to our collection of educational videos. Keep watching our channel for more content!

[@veeneshkumar4885]

Sir answer short kigye Karna plz plz ❤❤❤❤