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From the top of a platform, the angle of...

From the top of a platform, the angle of elevation of a tower was `30^@`. The tower was 45 m high and the horizontal distance between the platform and the tower was `40 sqrt3` m. What was the height of the platform?

A

40 m

B

5 m

C

`20 sqrt3` m

D

`45 sqrt3` m

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