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

Question 13

Question.  13

In Fig. 5.13, POR is a line. The value of a is

(a)

(a) 40°

(b)

(b) 45°

(c)

(c) 55°

(d)

(d) 60°

Detailed Answer with Explanation:

Equation: (3a+5)+(2a-25)=180. Solving gives a=40°.