A boy standing at one bank of river sees the top of a tree on the other bank directly opposite to the boy at an elevation of `60^@`. Stepping 40 metres back, he sees the top at an elevation of `30^@`.
What is the width of entire river?

A TV tower stands vertically on a bank of a canal. From a point on the other bank directly opposite the tower, the angle of elevation of the top of the tower is 60^(@) . From another point 20 m away from this point on the line joining this point to the foot of the tower, the angle of elevation of the top of the tower is 30^(@) (see figure below). find the height of the tower and the width of the canal. .

A TV tower stands vertically on a bank of a canal. From a point on the other bank directly opposite the tower, the angle of elevation of the top of the tower is 60^(@) . From another point 20m away from this point on the line joining this point to the foot of the tower, the angle of elevation of the top of the tower is 30^(@) (see Figure ). Find the height of the tower and the width of the canal.

person observes the angle of elevation of the top of a building as 30^(@) . He proceeds towards the building with a speed of, 25 (sqrt(3) -1) m/hour. After two hours, he observes the angle of elevation as 45^(@) . What is the height of the building, in metres?

Two poles of equal heights are standing opposite each other on either side of the road, which is 80m wide. From a point between them on the road, the angles of elevation of the top of the poles are 60^(@) and 30^(@) , respectively . Find the height of the poles and the distances of the point from the poles.

Two poles of equal heights are standing opposite each other on either side of the road, which is 80 m wide. From a point between them on the road, the angles of elevation of the top of the poles are 60^(@) and 30^(@) , respectively. Find the height of the poles and the distances of the point from the poles.