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PSQ = 86 / 2 = 43⁰
15. ACB = ADB = 35⁰ (krn sama2 termasuk sdt keliling yang berasal dari titik AB)
16. Panjang busur AC = 120/60 . 18 = 2.18 = 36 cm
17. Panjang busur KL = 120 .π.d
360
= 1 . 22. 21
3 7
= 22 cm
18. 72 . 22/7. 7 .7 = 154 / 5 = 30,8 cm²
360
19. Luas juring = 1/4. 3,14. 12.12
= 113,04
Luas sgtiga AOB = 12.12/2
= 72
Luas tembereng = 113,04 - 72 = 41,04 cm²
20. sdt AOB = 60 . 2= 120⁰
Luas juring AOB = 120/360 . 3,14. 30.30
= 942 cm²