Dengan mengadaptasi Phytagoras, diperoleh :
PQ² = QR² + PR²
15² = 9² + PR²
225-81 = PR²
144 = PR²
PR = 12cm
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Dengan mengadaptasi Phytagoras, diperoleh :
PQ² = QR² + PR²
15² = 9² + PR²
225-81 = PR²
144 = PR²
PR = 12cm