Question

He measures of two angles of a triangle are

45° and 54°. What is the measure of the
third angle?
(A) 81°
(B) 91°
(C) 99°
(D) 261°

Answer 1

The measure of the third angle in the triangle is 81°.

Step-by-step explanation:

In a triangle, the sum of the measures of all three angles is always 180°. So, to find the measure of the third angle, we need to subtract the sum of the measures of the given two angles from 180°.

Third angle = 180° - (45° + 54°) = 180° - 99° = 81°

Therefore, the measure of the third angle is 81°, option (A).

Learn more about Triangle angles