tolong bantu in ya kak no 21 pakai cara

10/8×72 = 5/4 × 72 = 5 × 18 = 90°
54/72 × 8 = 3 × 2 = 6 c

A)

POQ/ROS = PQ/RS
POQ/72 = 10/8
POQ/72 = 5/4
5(72) = 4(POQ)
5(72)/4 = POQ
POQ = 90 derajat

B)

QR/RS = QOR/ROS
QR / 8 = 54/72
QR/8 = 3/4
8(3) = 4(QR)
QR = 8(3)/4
QR = 6 cm