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     EduGorilla 
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    The angle of elevation of the top of the tower observed from each of the three points A, B and C on the ground, forming a triangle, is the same angle α. If R is the circum-radius of the triangle ABC, then the height of the tower is

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    1. R sin α
    2. R cos α
    3. R cot α
    4. R tan α
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