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Shown below is a solid made by joining a...

Shown below is a solid made by joining a right circular cylinder and a hemisphere of equal radius `(r cm)`. The total surface area of the solid is equal to the surface area of a sphere with twice the radius of this solid.
`
Which of the following gives the height of the cylinder in the above solid?

A

6r cm

B

6.5r cm

C

7r cm

D

7.5r cm

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