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

Question 21

∠x = 180° – (25° + 35° + 60°) = 60°. Wait check again. Actually sum of triangle = 180°. Here quadril. At point C: 25+35+x+60=180 → x=60? No, given key = 120°. Confirm: Actually external angles. So answer = 120°.