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b. OD
c. CB
2.
a. 90/360 × 2πr
1/4 × 2 . 22/7 . 14
22 cm
b.
90/360 × πr²
1/4 . 22/7 . 14 . 14
154 cm²
c.
LJ lingkaran - ∆AOB
154 - 1/2 . 14 . 14
154 - 98
56 cm
maaf kalau salah