**(21)** A ship is 120 meters away from a lighthouse. If the angle of elevation from the ship to the top of the lighthouse is 15 degrees, what is the height of the lighthouse?

- (a) 20 meters
- (b) 30 meters
- (c) 40 meters
- (d) 50 meters

**(22)** A person is standing on the top of a building that is 20 meters high. They spot a bird flying at an angle of elevation of 30 degrees from their position. How far is the bird from the person?

- (a) 10 meters
- (b) 20 meters
- (c) 30 meters
- (d) 40 meters

**(23)** A ladder is leaning against a vertical wall. The ladder is 15 meters long, and the angle between the ladder and the ground is 60 degrees. What is the distance between the base of the ladder and the wall?

- (a) 5 meters
- (b) 10 meters
- (c) 15 meters
- (d) 20 meters

**(24)** An airplane is flying at an altitude of 12,000 meters. If the angle of elevation from a ground observer to the airplane is 20 degrees, how far is the airplane from the observer?

- (a) 36,000 meters
- (b) 34,643 meters
- (c) 30,000 meters
- (d) 40,000 meters

**(25)** Two ships are approaching each other. One ship is 200 meters away from the other. If the angle of depression from the first ship to the second ship is 10 degrees, what is the distance between the two ships?

- (a) 20 meters
- (b) 34.64 meters
- (c) 40 meters
- (d) 50 meters