NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 5: Lines And Angles - Multiple Choice Questions
Question 34

Question.  34

If an angle is 60° less than two times of its supplement, then the greater angle is

(a)

(a) 100°

(b)

(b) 80°

(c)

(c) 60°

(d)

(d) 120°

Detailed Answer with Explanation:

Let angle = x, supplement = 180 − x.

Given: x = 2(180 − x) − 60 ⇒ x = 360 − 2x − 60 ⇒ 3x=300 ⇒ x=100°.

So greater angle = 100°.

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NCERT Exemplar Solutions Class 7 – Mathematics – Unit 5: Lines And Angles – Multiple Choice Questions | Detailed Answers