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sisi AB = PQ = 21
sisi AD = PS = 12
sisi DC = SR = 12
sisi BC = QR = x
Pytagoras
x² = (PQ-PS)² + (PS)²
x² = 9² + 12²
x = 81 + 144
x² = 225
x = √225
x = 15 cm
Panjang QR = 15 cm