Question

Find the measure of the third angle of a triangle if the measures of the other two angles are given.

118.6 and 42.3

Answer 1

The third angle is going to be 19.1

Answer 2

The three inside angles of a triangle equal 180.

Subtract the two known angles from 180.

180 - 118.6 - 42.3 = 19.1

The third angle is 19.1