Question

Case Study Questions
I.
Read the text given below and answer the following questions :
Once the maths teacher of Class 9 told students that today we will prove that the
sum of all three angles in a triangle is 180°
3
As shown in the figure, he told to draw any triangle ABC in the notebook. Furth
>
side BC was extended to D. Now the teacher said to draw CE parallel to BA.
Further, angle were named 1 to 5 as shown in the figure. Now answer the
following questions:
1: BA is parallel to CE and AC is a transversal line. which angle is equal to
212
D) 25
A) 22 B) 23 C)24
2. which angle is equal to 22?
A)22 B23 C)24
D25
3. What is the value of 23 24 + 25?
A) 180°
B)120° C)200°
D)360°​

Answer 1

Answer:

side BC was extended to D. Now the teacher said to draw CE parallel to BA.

Further, angle were named 1 to 5 as shown in the figure. Now answer the

following questions:

1: BA is parallel to CE and AC is a transversal line. which angle is equal to

212

D) 25

A) 22 B) 23 C)24

2. which angle is equal to 22?

A)22 B23 C)24

D25

3. What is the value of 23 24 + 25?

A) 180°j

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