## anonymous one year ago 12.) Find the volume of the cylinder in terms of pi.

1. anonymous

2. anonymous

my answer: 54 pi in. ^3. Is that correct?

3. anonymous

19.) A spherical balloon has a circumference of 23 cm. What is the approximate surface area of the balloon to the nearest square centimeter? my answer: 674 cm^2. Is that correct?

4. anonymous

5. anonymous

Thank you.

6. anonymous

For the second question, circumference is given by$C = 2 \times \pi \times r$Rearranging, you can determine the radius using$r = \frac{ C }{ 2\pi }$With the radius known, the surface area of a sphere is calculated using$SA _{\text{sphere}} = 4\pi r^2$

7. anonymous

I do not get the same answer as you did for the second question.

8. anonymous

9. anonymous

415 cm^2

10. anonymous

11. anonymous

would the answer be in the thousands?

12. anonymous

13. anonymous

Oh, I am sorry. its 168 cm^2

14. anonymous

Correct. Good job!