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Smiley75

  • 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

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  1. Smiley75
    • 5 years ago
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  2. sstarica
    • 5 years ago
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    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
    • 5 years ago
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    give it a try :)

  4. lokisan
    • 5 years ago
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    The volume of a cylinder is \[V=\frac{1}{3}(area_.base)(height)\]

  5. sstarica
    • 5 years ago
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    are you sure? because that's the volume of a cone loki

  6. lokisan
    • 5 years ago
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    ah...yes...kibosh the third. doing this too long...

  7. sstarica
    • 5 years ago
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    lol, np I do such mistakes too ^_^

  8. Smiley75
    • 5 years ago
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    ok

  9. sstarica
    • 5 years ago
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    did you get the result?

  10. Smiley75
    • 5 years ago
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    i guess..is it 3 centimeters?

  11. sstarica
    • 5 years ago
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    no

  12. Smiley75
    • 5 years ago
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    i dont get it then

  13. sstarica
    • 5 years ago
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    \[1131/40\pi = r^2\]\[r = \sqrt{1131/40\pi} = 9.42 = 9 cm \] substitute and solve for r ^_^

  14. sstarica
    • 5 years ago
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    do you get it now ? :)

  15. Smiley75
    • 5 years ago
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    yup thanks

  16. sstarica
    • 5 years ago
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    np :)

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