Elevation and depression problems

Draw a diagram and solve:

1. From a point 80 m from a building, the angle of elevation to the top is 35°. Find the height.
2. A plane is 1200 m above ground. Angle of depression to a point on the ground is 15°. Find horizontal distance.
3. A lighthouse is 60 m tall. Angle of depression to a boat is 12°. How far is the boat from the base?
4. From the top of a 25 m cliff, the angle of depression to a boat is 20° and to another boat further out is 10°. Find distance between the boats.

Submit Exercise