NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 6: Triangles - Problems and Solutions

Question 137

Question. 137

In Fig. 6.45, if ST = SU, then find the values of x and y.

Answer:

x = 129°, y = 51°

Detailed Answer with Explanation:

∠S = 78°. Remaining two equal angles = (180−78)/2 = 51°. By exterior angle property, x = 180−51 = 129°.