Question

Nomor 13 dan 15. tolong donk. pake cara yah?

Answer 1

2b=a+b
2b-b=a
b =a

3a+2b=180
3b+2b=180
5b=180
b=36°



x=4y
nilai Y
4y+2y+4y=180
10y=180
Y=18

nilai x
x=4y
x=4(18)
x=72°