Tolong yah dijawab degang benaryah, no 12, 13 aja ..

12. 180-65= 115
13. 3x + 2x = 180
5x = 180
x = 36
BOC = 2 x 36= 72

13. 72° = 180°:(3×+2×)=180°:5×=36×2=72°
12. 25°=90°-65=25°