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physics

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The drawing shows a person looking at a building on top of which an antenna is mounted. The horizontal distance between the person’s eyes and the building is 87.8 m. In part a the person is looking at the base of the antenna, and his line of sight makes an angle of 30.3o with the horizontal. In part b the person is looking at the top of the antenna, and his line of sight makes an angle of 33.8o with the horizontal. How tall is the antenna?

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