tolong dijawabya buat besok

11. 2x+3x=90°
=5x=90
x=90/5
x=18°

-2x°=2.18=36°
B.36°

12. 3x+(5x+20°)=180°
=3x+5x=180°
8x=180-20
8x=160
x=160/8
x=20°

-5x+20°=5.20°+20°=120°
A.120°

13. 2x+3x+3x+40°=360°
8x=360-40
8x=320°
x=320/8
x=40°

-2x=2.40=80°
B.80°

14. 2/3×90°
=60
=90-60
=30°
B.30°