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2 Bagun trapesium sebangun
DC=8 cm
PQ=21 cm
AB = 14 cm
BC=10 cm
QR?
penyelesaian:
AB/PQ =BC/QR
14/21 =10/QR
2/3=10/QR
2QR=10.3
2QR= 30
QR =15 Cm
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