Heron's Formula - Exercise 12.1 (Q1 - Q6) NCERT Solutions | Class 9 Maths Chapter 12

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Construction chapter

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419/420

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[@akshatxpc1116]

sir in first question can we first take out the length of 'A' from perimeter and then put it in heron's formula a+a+a*2

[@MagnetBrainsEducation]

Hi there! That's a great question! You can indeed use Heron's formula to find the area of a triangle, but it is important to understand how to use it properly. If you would like some help with this concept, please feel free to reach out to us and we can provide some additional resources and explanations. Thank you for your comment!

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Sir solve this question.... Find the area of trapezium whose parallel sides are 25cm, 13cm and other sides are 15cm, 15cm.

[@15_dreamyrays]

Area of trapezium = ½ × sum of parallel side × sum of distance between parallel sides. ∴ ½ × (25+13) × (15+15) = ½ × 38 × 225 = 4275cm2

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Thank you for taking the time to watch our video and for your kind words! We are delighted that you found it useful and that you understood the content well. We hope you continue to benefit from our free educational videos!

[@suryanshsingh-md4ox]

sir but first question me ham directly (a) ki value :-(3a=180 ) aise bhi kar ke nikal sakte hai

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You are right bro , then a=60

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[@ganeshpatle-if5mu]

sir if you check one thing in textbook the side c=120 then why are you taking 122 if we go according to textbook the answer will be complete different(Q2)??

[@avanidiwate4580]

Sir Q2 Calculations are wrong Let the sides of the triangular will be a = 122m, b = 12cm, c = 22m Semi-perimeter, s = a+b+c2 (122+120+224)m = 2642 m = 132m The area of the triangular side wall NCERT Solutions for Class 9 Maths Chapter 12 Heron's Formula Ex 12.1 Q2.1 Rent for 1 year (i.e. 12 months) per m2 = Rs. 5000 ∴ Rent for 3 months per m2 = Rs. 5000 x 312 = Rent for 3 months for 1320 m2 = Rs. 5000 x 312 x 1320 = Rs. 16,50,000.

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Right answer is 1650000

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Thank you sir for this video I'm seeing the video first-time I understand and In my surprise test I scored very good marks thank you so much sir

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Hlo

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Great explanation 👍👍

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[@jb_0_status]

in first question a+a+a=180 3a=180 a=60 With this we can also solve this direct in formula √s(s-a)(s-a)(s-a) √90(60-30)(60-30)(60-30) =900√3 Yes/No

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Tysm sir but any simpler for 2nd question

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Thank you for your comment! We try to make our videos as understandable as possible, but we will try to make the second question simpler in our next video.

[@MZS-s8r]

Sir i think a much easier way to do the first one is P=180 Triangle=180/3 Triangle=60 S=60+60+60 all divided by 2=90 S-a=90-60=30 S-b=90-60=30 S-c=90-60=30 put Herons Formula =90 x 30 x 30 x 30 root2700 x 30 Ans=root81000 I find this much easier please correct me if im wrong

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Sir I have a doubt sir question me to cm diya rehta hai fir cm square kyu laga dete ho answer me

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Bhai area nikalega to cm sqr m hi aayega na

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Kyu ke cm is multiplayed by cm so we get cm²

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Area ham cm² ya m² mtlb ham sqr mai hee laity hai 😊

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Yass also want to know whyy??

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Area = Square cm or m

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sir plzzz help root 270×150×100×20 how to do

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Thank u so much sir i learnt this chapter very clearly and able to do all sum 😊😊

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Thanku sir tomorrow my exam ❤😇

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Thank you for watching our video! We hope it helped you prepare for your exam tomorrow. Best of luck!

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21:23 answer -2 1650000

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Sir please tell can i start question without writing formula directly Like instead of s-a Directly (21-14) Sir marks will be dedducted in this way

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Yes , they will deduct 1 m from 3 mark q

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Please upload this complete ncert chapter upto exercise 12.2 and chapter areas of parallelogram and triangles

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Totally agree bro but I suggest you to attend some Grammer classes too.

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Thanks for the kind words! We're glad you appreciate our efforts to provide quality educational content. Keep up the good work and we're sure you'll do great things!

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Sir apke jo ek ek common word hai "apun" wo to mujhe bht pasand hai...😁

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so much best and awesome learning platform i have seen ever now my interst in maths is increased.........................................................

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Sir was obsessed by saying "divall" to "deevaar" and with that obsession he also Sayed "kilaye" to "kiraye" at 13:38😂😂

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Sir your teaching skills is very good.I really enjoy learing with you ..but could you pls make new video in these chapter including question 7 and 8 which has not been done and also 12.2 pls sir....v

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Sar aap kitna Achcha padhte ho aap aise hi padhte Raho Hamen bahut Khushi Hai dhanyvad

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Dhanyawad sirrr😄

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Sir your all videos is great more than our school teacher explanation but this method of doing this question was so lengthy my school teacher method was short and easy so sir .. otherwise uhh r the best

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Me also

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So much effective for me

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It would be a great help if u divide the video of any subject in short parts

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Hii

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:Sir in 1 question 3a-a =a kase aaya 2. 2 :Iska ans to 2a hoga 2

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Hi there! Thanks for taking the time to watch our educational videos. The answer to your question is 2A. We hope that our videos are helping you learn and understand the concepts easily. Please keep watching and keep learning!

[@vatsalshinde1252]

31:27 sir ans to q5 is 9000cm^2

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[@nikhilgamer2560]

Kese hoga please explain

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Sir thank you ..really a wonderful session

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If we have any doubt regarding the questions from where we should ask it?

[@Anjaliday1]

Ya

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Thank you, student! We're glad you enjoy our videos and find them useful. We'll keep making great content to help you learn and succeed in school.

[@newsmakerlive9740]

Actually I think aap jayda hard sikhate ho mere notes jayda simple ye aur understanding bhi so answer is same but method is different Soo I think you should teach this topic in simple method By the way you teach good but think on my words Thank you 😊

[@renukumari6592]

Sir 2nd solution me months ka spelling wrong hai👍

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Thank you for pointing out the mistake! We really appreciate it. We will make sure to fix this as soon as possible and we are glad that you found our video useful. Keep learning!

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Sir thankyou mero kafi ache tereh se samajh a gaya 😊😊

[@mdsaadullah3935]

Sir aise bna skte h kya 1 wla Q AB =BC =CA=a =Perimeter of triangle =180cm =perimeter of equilateral triangle =a+a+a =180=3a a=180 ➗ 3 =60 = AB =BC=CA=a =60 Semiperimeter =AB +BC+CA ➗2 S =60+60+60 ➗ 2 180 ➗ 2= 90 = Area of triangle ABC= s (s-a) ( s-b) s-c) = 90( 90-60)( 90-60) (90-60) =90 ✖30 ✖ 30 ✖30 =2 ✖3✖3✖5✖2✖3✖5✖30 ✖30 =2 ka square ✖ 3 ka square ✖ 5 ka square ✖ 30 ka square ✖3 = 2 ✖ 3✖5 ✖ 30 ✖ under root 3 = 900 under root 3 sir pls bataye ye porccess glt h ya shi ...

[@CutegirlJanvi-u2x]

Shi hai yrr 1 question ko kai sare method se kr skte hai

[@mdsaadullah3935]

@@CutegirlJanvi-u2x ok

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@@mdsaadullah3935 hmm

[@HGyt09]

sir explain me how come answer a/2 please

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Best explanation ever in maths thanku sir for this best explanation

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Hii sir me kunal chaudhary present Khad mohan nagar bulandshar

[@Rohitush]

Sir all these can be done in easy and short method also though if we understand the sum then the length doesn't matter at all but then also there are short methods too! ❤️🕊️

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Haaaaaaaaaaaaa😡

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Thank you very much sir because of you I was able to give my class test today

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Thanks sir you are not making lengthy video 🥰

[@MAGLADON_x]

Anyone tell me plz Why is - 3a/2 - a Is Solved into a/2 😔😔😔 I can't understand

[@MagnetBrainsEducation]

Hi there! We understand that this can be confusing, so let us help you out. The solution to 3a/2 is indeed a/2. To get that answer, all you need to do is divide both the numerator and denominator by 3. So 3a/2 is the same as (3a/3)/(2/3), which simplifies to a/2. We hope this helps!

[@MAGLADON_x]

@@MagnetBrainsEducationThanks Sir so much