When the angle of elevation of the sun increases from 30 to 60, the shadow of a tower decreases by 50 m. Find the height of the tower.
49.
A man standing in one corner of a square football field observes that the angle subtend by a pole in the corner just diagonally opposite to this corner is 60°. When he retires 80 m from the corner, along the same straight line, he finds the angle to be 30°. The length of the field is
20 m
40 m
D.
Let AB = BC = x metre,