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PS² + RS² = PR²
PS² + 7² = 15²
PS² = 225 - 49 = 176
PS = √176 = 13,3 cm
PQ = PS-QS = 13,3 - 4 = 9,3 cm (alas segitiga PQR)
Luas segitiga PQR
= 9,3x7/2
= 32,55 cm²