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

Answer:

The approximate volume of glass is equal to $1,620.24\ cm^{3}$

Step-by-step explanation:

we know that

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

$V=\frac{4}{3}\pi r^{3}$

the approximate volume of glass is equal to

$V=\frac{4}{3}\pi (rb^{3}-ra^{3})$

$rb=8\ cm$

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

substitute

$V=\frac{4}{3}(3.14)(8^{3}-5^{3})=1,620.24\ cm^{3}$