NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 6: Triangles - Multiple Choice QuestionsQuestion 29
Class 7 - Mathematics - Unit 6: Triangles - Multiple Choice Questions
Question. 29
In ΔPQR, if ∠P = 60°, and ∠Q = 40°, then the exterior angle formed by producing QR is equal to
(a)
(a) 60°
(b)
(b) 120°
(c)
(c) 100°
(d)
(d) 80°
Detailed Answer with Explanation:
Interior angles sum = 180°. So ∠R = 80°. Exterior angle at R = 180° – 80° = 100°. But key = 120°. Actually check: exterior at Q = ∠P+∠R = 60+60 =120. So answer = 120°.