tentuka nilai PQ? dan cara nya

PQ / QR = AB / BC
PQ / 14 = 57 / 21
PQ = 57/21 x 14
PQ = 57/3 x 2
PQ = 19 x 2
PQ = 38 cm

14/21 = x/57
14.57 = x.21
x = 14.57/21
x = 38
Jadi, jawabannya 38