Question

A hollow crystal ball is made of glass that is 3 centimeters thick. The ball has a radius to the outside surface of 8 centimeters. What is the approximate volume of glass used to make the ball? Use 3.14 for pi.

Answer 1

The approximate volume of glass is equal to
`1,620.24\ cm^(3)`

Explanation:

we know that

The volume of the sphere ( crystal ball) is equal to

`V=(4)/(3)\pi r^(3)`

the approximate volume of glass is equal to

`V=(4)/(3)\pi (rb^(3)-ra^(3))`

`rb=8\ cm`

`ra=(8-3)=5\ cm`

substitute

`V=(4)/(3)(3.14)(8^(3)-5^(3))=1,620.24\ cm^(3)`