ketahui QS = 8 cm QR = 17 cm dan PQ = 12 cm luas segitiga segitiga PQR adalah

QS = 8 cm
QR = 17 cm
PQ = 12 cm

QR^2 = QS^2 + SR^2
17^2 = 8^2 + SR^2
289 = 64 + SR^2
SR^2 = 289 - 64
SR^2 = 225
SR = \/225
SR = 15 cm

L PQR = 1/2 x PS x RS
L PQR = 1/2 x (PQ +QS) x RS
L PQR = 1/2 x (12+8) x 15
L PQR = 1/2 x 20 x 15
L PQR = 150 cm^2 (B)

Mohon dikoreksi lagi
Semoga terbantu :)