A circus artist is climbing a 20 m long rope, which is tightly stretched and tied from the top of a vertical pole to t

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Q 3001101928.     A circus artist is climbing a 20 m long rope, which is tightly stretched and tied from the top of a vertical pole to the ground. Find the height of the pole, if the angle made by the rope with the ground level is  30 ^{ \circ } (see Fig.)

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