Question

The measures of two angles of a triangle are 72° and 58°. Find the measure of the third angle.

Answer 1

The measures of two angles of a triangle are 72° and 58°.
Let the third angle be x.
Now, the sum of the measures of all the angles of a triangle is 180^o​.
$\therefore$ x + 72^o + 58^o = 180^o
⇒ x + 130^o = 180^o
⇒ x = 180^o​ $-$ 130^o
⇒ x = 50^o
​The measure of the third angle of the triangle is 50^o​.