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Langsung aja : Jawabannya. D

QR = BC . PQ/AB
QR = 5. 9/6
QR = 45/6
QR = 7 ¹/₂

PS = AD . PQ/AB
PS = 4 . 9/6
PS = 36/6
PS = 6

CD = SR . AB/PQ
CD = 6 . 6/9
CD = 36/9
CD = 4