A ladder 14 m long rests against a wall. If the foot of ladder is 7 m from the wall, then the angle of elevation is

1. 15°

2. 30°

3. 45°

4. 60°

A light house is 80 m high. The angle of elevation of its top from a point 80 m away from its foot along the same horizontal line is

1. 60°

2. 45°

3. 30°

4. 90°