Question 164687
A=B+20
C=2(A+B)+30
A+B+C=180
(B+20)+B+2(A+B)+30=180
B+20+B+2(B+20+B)+30=180
B+20+B+2B+40+2B+30=180
6B=180-20-40-30
6B=90
B=90/6
B=15 DEGREES FOR THE MIDDLE ANGLE.
A=15+20=35 FOR THE FIRST ANGLE.
C=2(15+35)+30=2*50+30=100+30=130 FOR THE THIRD ANGLE.
15+35+130=180
180=180