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Question - Heights and Distances - Angle of Elevation, Angle of Depression

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ConceptHeights and Distances - Angle of Elevation, Angle of Depression  

Question

A 21 m deep well with diameter 6 m is dug and the earth from digging is evenly spread to form a platform 27 m ✕ 11 m. Find the height of the platform.[Use `pi=22/7`]

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