Example 24 Let AP and BQ be two vertical poles at
points A and B, respectively If AP = 16 m, BQ = 22 m
and AB = 20 m, then find the distance of a point R on
AB from the point A such that RP2 + RQ2 is minimum Solution Let R be a point on AB such that AR = x m Then RB = (20 – x) m (as AB = 20 m)