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1.From the top of a 25 m tower, you have observed a stop sign that is 10 m away from the base of the tower. What is the angle of depression of the stop sign?

2.In an apartment building, a night light is mounted on a pole that is 7 m high. The night light illuminates the entrance of the building that is 30 m away from the base of the pole. What is the angle of depression of the night light?

3.Dada observes a small boat from a lighthouse. The top of the lighthouse where Dada is located is 40 m above the boat. If the angle of depression from the top of lighthouse to the boat is 18°, how far is the boat from the lighthouse?​