Question

Writing If the measures of two angles of a triangle are 86 and 12°, what is the measure of the third angle? Use pencil and paper. Explain how a straight angle is

related to the angles of a triangle.
The measure of the third angle is

Answer 1

Answer: 82 degrees

Explanation:

The sum of the angles in a triangle is 180 degrees which is a straight angle.

Let the unknown third angle be x.

Therefore, 86 + 12 + x = 180

98 + x = 180

x = 82