Lines and Angles Class 9 Maths in One Shot (Solving Important Questions/MCQs) | BYJU'S Class 9

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Join this Mission Mid-Terms series to revise Lines and Angles Class 9 Maths topics in detail. Lines and Angles is Chapter 5 in your NCERT Class 9 Maths syllabus. In this online class, your BYJU’S educator, Khushbu Ma’am, solves important questions and MCQs on Lines and Angles.
Some of the topics covered in this class are as follows:
- Parallel lines and a transversal
- Angle sum property of a triangle
If you are preparing for the upcoming mid-terms or the boards, this session is sure to help you be well-prepared for the exam.
We at BYJU'S always strive to give you the best. Add this video to your study plans to amplify your chances of cracking the upcoming exams!
Looking for similar video lessons? We have a host of class 9 Maths video lessons including revisions and doubt-clearing sessions on our BYJU’S - Class 9 & 10 channel. Subscribe to our BYJU’S - Class 9 & 10 channel now to get access to all the video lessons.
00:00 Lines and Angles Class 9 Maths in One Shot
2:40 ANTHE - Aakash National Talent Hunt Exam
5:33 Mission Mid-Terms
8:02 Recall
9:14 Types of Angles
11:21 Complementary angle
11:44 Supplementary angle
11:56 Adjacent Angles
13:52 Linear Pair
18:56 Classification
21:16 Linear Pair
21:56 What if we Extend the Ray?
24:05 Vertically Opposite Angles
25:42 Theorem
29:16 1st Question
31:50 2nd Question
33:49 Did you ever observed these closely?
34:18 Learning about Transversal Lines
35:51 Let’s have a look
37:12 Corresponding angles
37:49 Corresponding angles Axiom
40:09 3rd Question
42:19 4th Question
43:03 5th Question
45:13 Alternate angles
45:46 Alternate Interior Angles Theorem
46:28 Converse of Alternate Interior Angles Theorem
47:03 6th Question
48:32 7th Question
51:59 Co-interior Angles
52:38 Co-interior Theorem
53:36 Converse of Co-Interior Theorem
54:05 8th Question
57:04 Theorem
57:26 9th Question
1:00:03 Let’s sum up the angles of a Triangle
1:00:24 What about Exterior Angles?
1:01:06 Summary
1:01:44 Homework Question
1:01:54 BYJU'S Mini Learning program
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[@BYJUSClass910]

✍ Register yourself for ANTHE here: ⬇ Link byjus.com/aakash-byjus-anthe22/?BY_youtube_organic_9-10&AsWCL3facm4&BY_9-10_Description

[@sagar_gamer150]

I did not understand

[@Homosapiens67]

Homework : Answer : 30

[@akhilg7469]

oooooooooooooooooooooh

[@akhilg7469]

ghjm,kjhgvbnm @@sagar_gamer150

[@Purplegirlzzzz1234]

7:28 session starts

[@Gamersclan2009]

🫡

[@madhuritiwari7018]

Thanks bro

[@mamataparida2619]

As in the figure we have to find the value of x 2x+3x+x=180(linear pair) 6x=180 x=180/6= 30 So the value of x is 30 degree

[@BYJUSClass910]

Very Good Mamata, Keep Watching for such more amazing sessions😊

[@saharanlalita5634]

mamata it should be adjacent angle because linear pair has only two angles but this question has three angles plz rewatch the video

[@shilpa_prem101]

Or you can say them as supplementary angles

[@Debasishdas-ik1pn]

17:32 17:34 17:35 17:35 17:35 17:36 17:36 17:36

[@Debasishdas-ik1pn]

😂😂😂😂😂 18:04

[@rishibala8920]

Is tomorrow your exam?

[@zomacchy16]

yes 😂

[@rishibala8920]

@@zomacchy16 All the best

[@zomacchy16]

@@rishibala8920 Thank Youu! Appreciate it!

[@sudha9179]

Yes

[@rishibala8920]

@@sudha9179 All the best

[@mamataparida2619]

Thank you khusbhu mam for understanding me this chapter

[@ramachandran9590]

😏😏

[@shreyajadhav768]

Thanks ma'am... you prepared me for my today's test on lines and angles ❤❤❤

[@ranjitam4265]

Wonderful explanation!! Really loved it❤️

[@rishithakishor8363]

Thank you so much ma'am..............as I have my math test tomorrow.......I'll do well...thanks again ❤

[@BYJUSClass910]

Hello Rishitha, Hope that the session was helpful to you, All the best👍🏻

[@joicesguppyworld2795]

Can you do a revision session of This chapter in a more detailed and understanding way? ❤

[@pavanim.rgowda7715]

Mam thank you so much for explaining mam😊 it helped me a lot but i didn't understood last question

[@SHAFEEN456]

U r such beautiful teacher and such a beautiful teaching 🥰😍

[@netisandeham8178]

Mam this is a wonderful session 😊😊😊😊 thks for spending time for our students again thank you its nice 😊😊😊😊😊😊😊😊

[@Shanmugapriya-cj8ce]

Mam this is very easy Ans: x+ 2x + 3x = 180 ° ( linear pair ) 6x= 180 X = 180/6 X = 30° Option C Thankyou mam. Understood. The trick shots to understand various angles was very helpful thanks.

[@tejnooreducation5502]

Solution for h.w. question Let us assume x as 1x So, 1x+2x+3x= 180 degree Therefore, 6x= 180 degree Then,value of x will be X=180/6 So, x=30

[@Ananyaakathyr]

1X+2x+3x=180° ( linear pair ) 6x = 180° X= 180/6 X= 30° thank you it was really helping!

[@yusufateeb]

it is supplementary angles not linear pair but thanks for cofirming my answer 🙂

[@ytkrypto9381]

its not a pair coz it has 3 angles on a straight line (180 degrees) the reason is (sum of angles on a straight line is 180) 32:35 minutes

[@king_makers_rule]

your teaching was amazing mam.🤩🤩

[@nashmia8273]

x+2x+3x=180° ( linear pair ) 6x = 180° X= 180/6 X= 30° Thank you for the class! Greatly explained

[@DasarathBasfore-lu5qo]

Tum ensta chalati ho

[@DasarathBasfore-lu5qo]

Bolo

[@bushrahuda3863]

homework question answer is option c 30 degree we need to find the value of x so, x+2x+3x=180 (by linear pair) 6x = 180 x=180/6 x= 30 degree.

[@cico2530]

no you r wrong its the sum of straight angle ur proof is wrong mark can be gone

[@joicesguppyworld2795]

Thank you maam ❤

[@nisargaappu4058]

Homework question -30°

[@Sureshbabu-q9x]

Thank you for your teaching style 😊😊😊😊😊😊😊😊😊😊

[@vanshikasharma6962]

Thanks ma'am for such a great explaination

[@shylashubha2997]

Your teaching os CC crystal clear

[@Vanshikabundela]

Best explanation ever !!!

[@PROMPTINSAAN]

GOOD EVENING MAM SORRY MAM I DIDN'T ATTEND THE CLASS BECAUSE I WAS SLEEPING 😴 BTW MAM I WATCHED RECORDED CLASS I UNDERSTOOD ALL CONCEPTS BUT A FEW THINGS THAT I DIDN'T UNDERSTOOD I WILL CLEAR IN YOUR DOUBTS SOLVING CLASS HERE IS THE ANSWER OF THE HOME WORK QUESTION IN THE QUESTION WE NEED TO FIND VALUE OF X ACCORDING TO THE FIGURE 2X+3X+X=180 (LINEAR PAIR) 6X=180 X=180/6 X=30 OPTION NO :- C IS THE CORRECT ANSWER THANK YOU SO MUCH MAM FOR THIS LOVELY CLASS

[@mamataparida2619]

Thanks for telling my mistake

[@PROMPTINSAAN]

@@mamataparida2619 No worries dost

[@dhruviorhiyapatel9223]

Please make 1 more session full on numerical of lines and angle

[@BYJUSClass910]

Hello Dhruvi, We will definitely come up with such session for you👍🏻

[@bluehubgamingjj2601]

Bro which numerical

[@nitinnarwal8025]

@@bluehubgamingjj2601 shi bola bhai maths mein numerical nhi hoti sums hote h 🙄🙄

[@varunkirthik5023]

Thank you mam I can understand your explanation clearly and I got more marks then by my before exam

[@sanjeedakureshi3370]

What is the difference between linear pair & supplementary angles?

[@revapanwar3925]

helped a lot!!!

[@shivangi9910]

mam how should I study? When I concentrate then your face does not let me concentrate ?

[@endrcc]

@@shivangi9910 💀

[@SeemaSharma-sp5ck]

This is very helpful

[@saharanlalita5634]

answer of homework question : x + 2x + 3x = 180 ( adjacent angle) 6x = 180 x = 180/6 x = 30 answer = 30

[@BYJUSClass910]

Great Saharan, Keep watching for more amazing sessions👍🏻

[@chanchalyadav2117]

Hi mam I am kusum and i have a doubt if two lines intersect each other, then the vertically opposite angle are equal how ?

[@suganyar9884]

Through proof of vertically opposite angle therom it has been proved

[@devilsbeat6077]

Very nice session thankyou somuch

[@BYJUSClass910]

Stay tuned to our Channel for further updates on upcoming Amazing Sessions 👍

[@pritirai7120]

Corresponding and voa and alternate angles

[@smmamm4050]

I understand very well

[@saahitra6959]

Very very clear explanation...Thank you very much mam!! It helped me a lot for my test...

[@COSMIC_HOME08]

Answer is 30 degree

[@tanisha.s5724]

30 degree

[@aliamiry740]

Does the steps to proof should be in a specific order??

[@lakshmimegham9295]

Why cant x cant be equal to 127? They are corresponding angles??

[@dasiraju1979]

1:01:50

[@tharanipaulraj7843]

Thank you mam

[@indulekhasuresh6216]

it was understandable and helpful .........

[@anjanagopakumar3954]

my fav math tr Khushbooo mam!!

[@Pavana_22]

21:33 4 linear pairs

[@UtkarshaNaik-q7p]

Tr your r nice

[@mr_nawab._666]

Ritik sir is emotion ❤❤

[@essentialnoledge]

ty for a great session

[@BYJUSClass910]

Hey Muhaz, Stay tuned to our Channel for further updates on upcoming Amazing Sessions 👍

[@ArjunKumar-king06]

Homework Time! Answers The Anwer I get is x = 30 which is option C How I get it? 2x + 3x + x = 180 .......(supplementary angles) 6x = 180 Dividing 6 on both sides, we get x = 30 Hence, it is the final answer

[@digitalleadshub-p7b]

Mam I saw your video of lines and angles on Mathematics Class IX channel that was 8 years ago

[@sharafatmalik5378]

Ritik Sir is the best teacher of KZbin, no one can explain better than him.

[@AyushMehra-b2b]

Mam ❤❤❤

[@bindusuresh4412]

Mam do u take tutions your explanation is wonderful

[@broken_deeds]

Mam how to login in live class and how much fee for only math

[@-CharuIniyal]

Wonderful session ma'am

[@mspranavjai7070]

i hav my math annuals tommo and im 12 chaps due this helped me a lot thnx a lot :)

[@einsteineinstein1254]

Is byjus stil allve

[@zeenethaseeb6206]

x+2x+3x=180°( linear pair 6x=180° x=180/6=30°

[@bydrfxjctbufyjgib]

Good afternoon mam

[@krishnegowda8228]

Mam can u please make a video on the chapter exponents and surf with more numericals solving???please And thank you for this ..

[@krishnegowda8228]

Am ur new subscriber.. Do I get the msg if u r taking live session??

[@BYJUSClass910]

Hey Krishne, We will definitely come up with such session for you👍🏻

[@nanuraj2039]

Video started in 7:30

[@hehehehehehe2387]

Ty bro

[@anshuboi2678]

Home work ans. Is 30°

[@vinodmk1335]

Mam there is an lagging

[@badarunnisa3827]

I have a request can you please do excercise of cbse book

[@Kingluciferx_2008]

homework question X+2x+3x=180° ( linear pair ) X+5x = 180° 6x= 180° X= 180/6 X= 30° so option c is correct

[@nihana2445]

isn't the reason Angles on a straight line bcz linear pair means there are only 2 angles

[@avanishgaming8525]

good evening girl

[@mamataparida2619]

As in the figure we have to find the value of x 2x +x+3x=180(linear pair) 6x=180 x=180/60= 30° So the value of x is 30°

[@PROMPTINSAAN]

@mamata paride You did the answer right but you did a silly 😜 mistake or a small mistake in 4 line the mistake was X=180/60 If X=180/60 then the answer would be 3 nor 30 So in that step X=180/6 X=30 Option c is the correct answer Thank you 😊 have a wonderful day

[@mkajal1001]

Right right right right righ..........

[@jimmaroshinis]

Thank you mam

[@gopalakrishnajalagari3069]

❤❤❤❤❤❤❤ thankyou mam for helping me

[@ElakkiyaCM]

Mam 102 degree is a what angle

[@akash-yq4ck]

Thankyou ma'am

[@ChanchalJain-wq4us]

Thank you mam for the explanation I have done this chapter 2 times but i was not able to understand but now its very easy thanks a lot mam I am Apeksha Jain..

[@vedansh9160]

X-30°

[@aartitalwar4459]

Yes

[@ManojYadav-ss4hn]

33:06 mam pls tell why didnt you took 3 times 5y

[@tanmayranjan6769]

1:01:16 answer is 30

[@GOGIREDDYTAGORE]

very good

[@aayushbabu7100]

Kis ko Hard work lgta h yhi chapter 🤔🤔🤔🤔🤔🤔🤔🤔🧐🧐🤨🙄😒

[@broken_deeds]

Mam 30 degree is answer for homework question

[@ShaikShaeena-ks1kq]

Home work problem (C) 30

[@shaziaaijaz6634]

Hi mam ,I am from Kashmir i want a class for my daughter who iz studying in class 4 ,plzz hw i will contact wd u

[@bganesh2472]

C=30

[@provawaitpegu4039]

Mam how become angle AOD + angle AOC

[@swapnaswapna1889]

The value of x is 30° mam

[@PritiGazane]

Ma am please show sample paper of maths

[@noorrostam2281]

توزک صبر تي ناگه م

[@Shreee_09]

How did u get 36°?

[@urvashikashyap6150]

Mam linear pair angles are same to supplementary angles ?

[@urvashikashyap6150]

Mam pls tell me

[@venutharayil]

All the best to all legends who are here cause tomorrow is your exam 😂👍 Mam love your explanation ❤️

[@SanchitBisht-vm4ft]

Mam you are very cute and beautiful 🥰🥰 thanks for teaching us😊😊

[@sarosugu898]

Answer is option is 'c' that means 30

[@BYJUSClass910]

Good try Saro, Keep Learning with us😊

[@RajKumar-jj5jp]

Thanks man

[@srinivasang2385]

HOME WORK QUESTIONS ANSWER IS : (c) 30

[@VinitaParalkar]

Hii mam 29:06

[@koteeswaril8261]

Thank you mam for wonderful session, your interaction was nice

[@BYJUSClass910]

Hai Kotteswari, Glad you liked it! Stay tuned for more such Amazing Sessions🤗

[@nisthapatel9066]

X +2X+3X=180 ( Linear pair) X+5X=180 6X =180 X=180/6 X=30 Answer c is right answer Thank you for beautiful explanation ☺️😊

[@BYJUSClass910]

Good Nistha, Stay tuned to our Channel for more Amazing sessions👍🏻

[@prempremyadav9032]

Please 1 more session on ncert ex 6.1 and 6.2 please

[@प्रोगेमिंग-थ8व]

😢😮😅😊🎉🎉❤