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If the angle of elevation of the Sun...

If the angle of elevation of the Sun changes from `30^(@)` to `45^(@)` , the length of the shadow of a piller decreases by 20 metres .The height of the pillar is

A

`20 (sqrt(3) - 1)`m

B

`20(sqrt(3) + 1)m`

C

`10(sqrt(3) - 1)m`

D

`10(sqrt(3) +1)m`

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