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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[Debasishdas-ikpn]

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

[mamataparida]

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

[mamataparida]

Thank you khusbhu mam for understanding me this chapter

[SHAFEEN]

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

[shreyajadhav]

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

[Shanmugapriya-cjce]

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.

[joicesguppyworld]

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

[ranjitam]

Wonderful explanation!!
Really loved it❤️

[tejnooreducation]

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

[bushrahuda]

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.

[rishithakishor]

Thank you so much I have my math test do well...thanks again ❤

[netisandeham]

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

[Ananyaakathyr]

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

[nashmia]

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

[pavanim.rgowda]

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

[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

[Sureshbabu-qx]

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

[sanjeedakureshi]

What is the difference between linear pair & supplementary angles?

[saharanlalita]

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

[shivangi]

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