## Smiley75 4 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. Smiley75

2. sstarica

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. sstarica

give it a try :)

4. lokisan

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

5. sstarica

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

6. lokisan

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

7. sstarica

lol, np I do such mistakes too ^_^

8. Smiley75

ok

9. sstarica

did you get the result?

10. Smiley75

i guess..is it 3 centimeters?

11. sstarica

no

12. Smiley75

i dont get it then

13. sstarica

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

14. sstarica

do you get it now ? :)

15. Smiley75

yup thanks

16. sstarica

np :)

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