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B.9cm karena 4,5cm x 2 = 9Matematika SMP Kelas VIII
1] PR // QR
∠PTR bertolak belakang dengan ∠STQ
∠SQT = ∠RPT
maka, ΔPTR sebangun dengan ΔSTQ
2] PT/ST = PR/QS
3 cm / 5 cm = 4,5 cm / QS
QS = 5 x 4,5 / 3
QS = 7,5 cm