semua nomor ya pake caranya juga

9. 120°/360° × 2×phi×r
120°/360°×2×22/7×7
1/3×44 =44/3 =14 ⅔cm (d)
10. 60° / 360° × 22/7×7×7
1/6×22×7= 154/6
25 ⅔ (a)
11. Luas juring = x/360° × luas lgkrn
12 = x/360° × 108
1 = x/360° × 9
9x = 360°
X =360 / 9
X = 40° [c]
12. 80 :2 =40 (b)