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# If i have a 72 cubic inch CYLINDER that is 11 inches long, what is diamater of this cylinder?

If i have a 72 cubic inch CYLINDER that is 11 inches long, what is diamater of this cylinder?

163Views8Replies

If i have a 72 cubic inch CYLINDER that is 11 inches long, what is diamater of this cylinder?

Volume = Pi * radius

^{2 * height}radius

^{2 = volume \ height = 72\11 = 6.54}radius = 6.54

^{0.5 = 2.558 inches}diameter = 2 * radius = 5.116 inches

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Stupid formatting. You get the picture :)

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The Formula is wrong! Pie are round, Cake are square! LOL

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Too bad "CHEAT" isn't one of the flag options.

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If you have measured the length, then you should be able to use the same ruler to measure the diameter.

_{Asking other people to do your homework is called cheating.}Select as Best AnswerUndo Best Answer

I hate word problems that make you look like a moron... "A building is 300ft tall and casts a shadow on your friend, you measure that your friend is 200ft away from the building and casts a shadow that is 40ft long. How tall is your friend."

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The volume of a cylinder the area of the base times the length (v = pi * r

^{2}* l), so swapping this around a bit, theradiusis sqrt( V / (pi * h)).Putting in your values : r =sqrt(72 / (pi * 11)) = 1.443 inches.

So the diameter is twice that . . .

2.886 inches.^{(No doubt some smarty pants will answer this with all the correct symbols shown ;¬)}Select as Best AnswerUndo Best Answer

Oooops. Thanks, I left PI out my calcs :D

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