Question

This beach ball has a surface area of 379.94 inches². What is its diameter? Use 3.14 for π.

Answer 1

11 inches

Explanation:

We know that
`SA=4\pi r^2`. We know that
`SA=379.94` and that
`\pi\approx3.14`. We solve for
`r`:
`379.97=4*3.14* r^2`

`r^2=30.25`

`r=5.5`

Since
`d=2r`, the diameter of the sphere is 11 inches.