The angle of elevation of the sun, when the length of the shadow of a tree 3 times the height of the tree, is:

The angle of elevation of the sun, when the length of the shadow of a tree 3 times the height of the tree, is:

A. 30º
B. 45º
C. 60º
D. 90º

Answer: A.

From a point P on a level ground, the angle of elevation of the top tower is 30º. If the tower is 100 m high, the distance of point P from the foot of the tower is:

From a point P on a level ground, the angle of elevation of the top tower is 30º. If the tower is 100 m high, the distance of point P from the foot of the tower is:

A. 149 m
B. 156 m
C. 173 m
D. 200 m

Answer: C.

An observer 1.6 m tall is 20-3 away from a tower. The angle of elevation from his eye to the top of the tower is 30º. The heights of the tower is:

An observer 1.6 m tall is 20-3 away from a tower. The angle of elevation from his eye to the top of the tower is 30º. The heights of the tower is:

A. 21.6 m
B. 23.2 m
C. 24.72 m
D. None of these

Answer: A.

The angle of elevation of a ladder leaning against a wall is 60º and the foot of the ladder is 4.6 m away from the wall. The length of the ladder is:

The angle of elevation of a ladder leaning against a wall is 60º and the foot of the ladder is 4.6 m away from the wall. The length of the ladder is:

A. 2.3 m
B. 4.6 m
C. 7.8 m
D. 9.2 m

Answer: D.