Question

. One of the base angles of an isosceles triangle 65⁰. Find its angle of vertex.

Answer 1

Since ΔABC is on isosceles triangle

∠B=∠C

∠B=65 °

∠C=65 °

∠A+∠B+∠C=180°

∠A+130 °=180°

∠A=180 °-130°

∠A=50°