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PR² = 12² + 9²
PR² = 144 + 81
PR = √225
PR = 15
PS² = 24² + 7²
PS² = 576 + 49
PS =√625
PS = 25
Maka RS
RS² = 25² - 15²
RS² = 625 - 225
RS = √400
RS = 20
PS² = 24² + 7²
PS² = 576 + 49
PS = √625
PS = 25
PR² = PQ² + QR²
PR² = 12² + 9²
PR² = 144 + 81
PR = √225
PR = 15
RS² = PS² - PR²
RS² = 25² - 15²
RS² = 625 - 225
RS = √400
RS = 20 (B)