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10 = OC
OC² = OE² + CE²
10² = 6² + CE²
100 = 36 + CE²
64 = CE²
8 = CE
CD = 2 . CE
= 2. 8
= 16 cm Jawabannya C
OE = 6
CD = 2 x DE
(DE)^2 = (OC)^2 - (OE)^2 = 10^2 - 6^2 = 100 - 36 = 64
DE = √ 64 = 8
CD = 2 x 8 = 16