The second angle of a triangle is 20° more than the first angle, and the third angle is twice the measure of the first angle. Find the measures of the angles.

Answer 1

S=20+F

T=2F

F+S+T=180

F+20+F + 2F = 180

4F = 180-20 = 160

F =160/4 = 40 degrees= first angle

S=60 degrees = second angle

T =80 degrees= third angle