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15/21 = 10/qr
15qr = 21x10
15qr = 210
qr = 210/15 = 14
lalu .
buat persamaan .
PQ/PT = ST/QR
21/15 = 10/QR
10.21/15 = QR
42/3 =QR
14 = QR
QR panjangnya 14 cm