You can put this solution on YOUR website! One angle of a triangle is 20 degrees. The second angle's measurement is four times the third. What is the measure of the third angle?
Sum of the interior angles of any triangle is 180 degrees.
Let x = measure of third angle
and 4x = measure of second angle
20 + 4x + x = 180
20 + 5x = 180
5x = 160
x = 32 degrees (third angle)