mohon bantuannya dengan cara terimakasih

sudut QRP = 180°-(105°+30°) = 180°-135°= 45°

panjang QR =

PQ/sin QRP = QR/sinRPQ
464√2/sin45° = QR/sin 30°
464√2/(1/2√2) = QR/(1/2)
QR = 464√2/√2 = 464 cm