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From the top of a platform 5 m high, the...

From the top of a platform 5 m high, the angle of elevation of a tower was `30^@` . If the platform was positioned `40 sqrt3` m away from the tower, how tall was the tower?

A

40 m

B

`20 sqrt3` m

C

`30 sqrt3` m

D

45 m

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