Question

find the measure of the angles of a triangle if one of the angles is 140degrees and the other two angles are equal​

Answer 1

let us consider any ∆ABC

angle A = 140°

given that the other two angles of the triangle are equal.

➡ angle B = angle C

now, we know that the sum of all interior angles in a triangle is 180°

therefore angle A + angle B + angle C = 180°

➡ 140° + angle B + angle B = 180°

➡ 2angleB = 180° - 140°

➡ 2angleB = 40°

➡ angleB = 40/2

➡ angle B = 20°

hence, the other two angles (angle B and angle C) is 20°