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A person, walking 20 mts from a point to...

A person, walking 20 mts from a point towards a flagpost along a horizontal passing through its base, observes that its angle of elevation changes from `30^(@)` to `45^(@)` . Find the height of the flag-post.

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Verified by Experts

The correct Answer is:
`10(sqrt(3)+1)`mts
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