If the angle of elevation of the sun dec...

If the angle of elevation of the sun decreases from `45^(@)` to`30^(@)` , then the length of the shadow of a pillar increases by 60m . The height of the pillar is

A

`60(sqrt3+1)m`

B

`30(sqrt3-1)m`

C

`30(sqrt3+1)m`

D

`60(sqrt3-1)m`

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