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Verified answer
CD/QR = AD/PQ4/a = 5/10
4/a = 1/2
2 x 4 = a
8 cm = a
AD/PQ = BC/RS
5/10 = 6/b
1/2 = 6/b
b = 6 x 2
b = 12 cm
Jadi jawabannya B. 8 cm dan 12 cm
*semoga membantu. sukses selalu ^_^