## 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