Here's the question you clicked on:
jedidiah
An official volleyball measures 27 inches in circumference. find surface area.
that's for the circumference.
so you need to find the radius so then the circumference formula is \[C = 2\pi r\] in your question you have \[27 = 2 \pi r\] make r the subject... when you have the value of r substitute it into the formula for surface area of a sphere \[SA = 4\pi r^2\]
4pir^2 4*3.14(27/2)^2 12.56(13.5)^2 12.56*182.25 2,289.06
I think your value for the radius is incorrect @heathernelly
a bathroom floor tile measures 6 in on a side. if the whole floor contains 100 tiles, what is the area of the bathroom floor in square ft. Note: 1 ft = 12in
well go back to the circumference formula and make r the subject... correctly...