Posted by **Emma** on Sunday, May 4, 2014 at 8:46pm.

Please help me

1.The surface are of the exterior of hollow rubber ball is 16pi in^2.The rubber is 1/4 inch thick. Find the surface are of the interior of the ball.

2. The length of each side of a cube is 6 inches long. Find the exact area of a sphere inscribed in the cube.

- Geometry -
**Steve**, Sunday, May 4, 2014 at 11:48pm
evidently r=4

so, the inside radius is 3.75

The inside area is 4pi * 3.75^2

The inscribed sphere has a diameter of 6, and a radius of 3.

v = 4/3 pi r^3

plug and chug

also, the length is not six inches long. Each side is six inches long; the length is just six inches.

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