Question

The diameter of a baseball is 7.5cm. What is the surface area of a baseball? What is the volume?

Answer 1

the surface area of a sphere is

$4\pi r^2$

and r=diameter/2

so r= 3.75

and

$surfacearea=4\cdot\pi\cdot3.75^2=176.71cm^2$

and the volume of a sphere is

$\frac{4}{3}\cdot\pi\cdot r^3$

so:

$\text{volume}=\frac{4}{3}\cdot\pi\cdot3.75^3=220.89cm^3$