Question

prove it in triangle
angle C=angle3B=angle2(A+B)

Answer 1

A+B+C=180
A+B=180-C
{A+B=180-3B}
3B=2(180-3B)
3B=360-6B
9B=360
B=40
C=3B
C=3×40
C=120
A+B+C=180
A+120+40=180
A=180-160
A=20



A=20, B=40, C=120
hope its help u

Answer 2

A+B+C=180
A+B=180-C
{A+B=180-3B}
3B=2(180-3B)
3B=360-6B
9B=360
B=40
C=3B
C=3×40
C=120
A+B+C=180
A+120+40=180
A=180-160
A=20



A=20, B=40, C=120
hope its help u