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Dik :PQ = PR
QR = 8 cm
Dit :
PS = ...?
Jawab :
jika PQ = QR, maka segitiga tsb dibentuk oleh 2 segitiga siku-siku yang kongruen, maka QS = SR
QR = QS + SR
8 = 2QS
QS = 8 / 2
QS = SR = 4 cm
PS² = QS x SR
PS² = 4 x 4
PS² = 16
PS = √16
PS = 4 cm