5. a. The height of a tower is 10m and the length of its shadow is
10m. Then calculate the sun's altitude.
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"The height of a tower is 10 m. Calculate the height of its shadow when Sun's altitude is 45°. In figure, AB is the tower and BC is the length of the shadow when the Sun's altitude is 45°, i.e. the angle of elevation of the top of the tower from the tip of the shadow is 45°. Thus, the height of the shadow is 10 m."
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