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= 3,14 x 10²
= 3,14 x 100
= 314 cm²
luas juring AOB= 314 / 4 = 78,5
luas segitiga AOB= a.t / 2
= 10.10 / 2
= 50cm²
luas yg diarsir = 78,5 - 50 = 28,5 cm²
jawaban C
17. sudut pusat juring / sudut lingkaran = luas juring/ luas lingkaran
∠pusat juring / 360° = 123,2 / 616
∠pusat juring = 360 x 123,2 /616
= 72°
jawaban D
18. MN² = ON² - OM²
= 26² - 10²
= 676 - 100
= 576
MN = √576
= 24
jawaban D
19. B.bersinggungan
20. g² = d²-r²
= 17² - 8²
=289 - 64
= 225
g = √225
= 15
jawaban C