A vessel is in the form of a frustum of a cone. Its radius at top end is 10 m and the bottom end is 5 m. Its volume

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Q 3062123935.     A vessel is in the form of a frustum of a cone. Its radius at top end is 10 m and the bottom end is 5 m. Its volume is 402 \pi cubic meter. Find its height.
A

5.68 m

B

6.89 m

C

7.21 m

D

8.34 m

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