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Ryan is standing at the top of an observation tower. He points his flashlight toward the horizon then slowly lowers it until he sees a cat. The angle of depression from his flashlight to the cat is 60º. Ryan continues to lower the beam of the flashlight until he sees a dog at an angle of depression of 75º. What are all the side lengths of the triangle.

From a certain point, the angle of elevation to the top of a building is 21o. At a point 85m closer to the building, the angle of elevation is 40o. Calculate the height of the building.