NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 6: Triangles - Multiple Choice Questions

Question 19

Question.  19

In Fig. 6.9, BC = CA and ∠A = 40°. Then, ∠ACD is equal to

(a)

(a) 40°

(b)

(b) 80°

(c)

(c) 120°

(d)

(d) 60°

Detailed Answer with Explanation:

Isosceles: ∠B = ∠C = 70°. Exterior ∠ACD = 180° – 100° = 80°.