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

Question 126

Question. 126

Find the value of x in Fig. 6.38.

Answer:

x = 20°

Detailed Answer with Explanation:

∠B + ∠A + ∠C = 180° ⇒ 30° + 80° + ∠C = 180° ⇒ ∠C = 70°. Since CE ⟂ CD, ∠x = 90° − 70° = 20°.