Question

The measure of two angles of a triangle are equal. If the measure of each equal angle is ${45}^0$, find the measure of the third angle.

• A. ${50}^0$
• B. ${90}^0$
• C. ${40}^0$
• D. None of these

Answer 1

Answer: (B)

${90}^0$

Given two angles of triangle are equal$\left(45°\right)$.

By the angle sum property of triangle, sum of all $3$ angles of a triangle is $180°$.

Let third angle be $x$, then

$45°+45°+x=180°⟹x=180°-45°-45°$

$⟹x=90°$