NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 5: Lines And Angles - Multiple Choice Questions

Question 26

Question.  26

In Fig. 5.22, the value of a is

(a)

(a) 20°

(b)

(b) 15°

(c)

(c) 5°

(d)

(d) 10°

Detailed Answer with Explanation:

Given angles 90+40+5a=180 ⇒ 5a=50 ⇒ a=10°.