From a point P on the ground the angle of elevation of the top of a tower is 30° and that of the top of a flag staff fixed on the top of the tower, is 60°. If the length of the flag staff is 5 m, find the height of the tower.
Let RQ be the tower and SR be the flag staff.
`=>x=hsqrt3 " .....(i)"`
From (i) and (ii), we get
Hence, the height of the tower is 2.5 metres.