## anonymous 3 years ago An official volleyball measures 27 inches in circumference. find surface area.

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1. anonymous

that's for the circumference.

2. campbell_st

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 $SA = 4\pi r^2$

3. anonymous

4pir^2 4*3.14(27/2)^2 12.56(13.5)^2 12.56*182.25 2,289.06

4. anonymous

thanks :)

5. campbell_st

6. anonymous

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

7. campbell_st

well go back to the circumference formula and make r the subject... correctly...

8. anonymous