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

Question 36

Question.  36

In Fig. 5.29, PQ ∥ RS and a : b = 3 : 2. Then f is equal to

(a)

(a) 36°

(b)

(b) 108°

(c)

(c) 72°

(d)

(d) 144°

Detailed Answer with Explanation:

a:b=3:2. So let a=3k, b=2k. Then a+b=180 ⇒ 5k=180 ⇒ k=36. So a=108, b=72. f corresponds to a =108°.