Question

What is the third angle of the triangle if the angles are 15 and 86

Answer 1

The three angles in a triangle always add up to 180 degrees. So:
15+86+x=180
x= 180-101
x = 79
The third angle is 79 degrees

Answer 2

79 degrees

Explanation:

there are 180 degrees in a triangle

if you deduct the sum of 15 and 86, which is 101, the third angle must measure 79 degrees