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CD/CA = CE/CB
3/5 = CE/(CE + EB)
3/5 = CE/(CE + 8)
5CE = 3(CE + 8)
5CE = 3CE + 24
2CE = 24
CE = 12 cm (C)
7. Karena ΔRSU sebangun dengan ΔRPQ, maka:
SU/PQ = RU/RQ
9/12 = 15/(RU + UQ)
9/12 = 15/(15 + UQ)
180 = 135 + 9UQ
45 = 9UQ
5 = UQ
RQ = RU + UQ
= 15 + 5 = 20 cm (D)