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Verified answer
JawabPR² = 4² + 2²
PR² = 16 + 4
PR² = 20
PR = √20 = 2√5
QR² = 4² + 8² = 16 + 64 = 80
QR² = √80 = 4√5
PR²+QR² = PQ²
20 + 80 = (2+8)²
100 = 100
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