## anonymous 5 years ago Todra investigates the measures of a cylinder in math class. she knows that the volume of the cylinder is 1131.0 cubic centimeters. todra determines that the length of the cylinder is 40 centimeters. What is the radius of the cylinder? a. 1 centimeter b. 2 centimeters c. 3 centimeters d. 4 centimeters

1. anonymous

2. anonymous

alright, you have the given which is the following: - V = 1131.0 cm^3 - L = H = 40 cm and we know that the general formula of the volume of the cylinder is : $V= \pi r^2 h$ you have V and you have H, substitute and find R ^_^

3. anonymous

give it a try :)

4. anonymous

The volume of a cylinder is $V=\frac{1}{3}(area_.base)(height)$

5. anonymous

are you sure? because that's the volume of a cone loki

6. anonymous

ah...yes...kibosh the third. doing this too long...

7. anonymous

lol, np I do such mistakes too ^_^

8. anonymous

ok

9. anonymous

did you get the result?

10. anonymous

i guess..is it 3 centimeters?

11. anonymous

no

12. anonymous

i dont get it then

13. anonymous

$1131/40\pi = r^2$$r = \sqrt{1131/40\pi} = 9.42 = 9 cm$ substitute and solve for r ^_^

14. anonymous

do you get it now ? :)

15. anonymous

yup thanks

16. anonymous

np :)