No 10,11,12 tolong!!!!!

10. 3x + 20 + 2x = 180°
5x = 180 – 20
5x = 160
x = 32
sudut G = 2x
= 2. 32
= 64 (C)
11. x – 15 + 4x + 20 = 180
5x = 180 – 5
5x = 175
x = 35 (C)
12. C

10. Sudut lurus = 180° .