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

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

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Jayefuu (author)2009-06-29

Volume = Pi * radius2 * height

radius2 = volume \ height = 72\11 = 6.54

radius = 6.540.5 = 2.558 inches
diameter = 2 * radius = 5.116 inches

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Jayefuu (author)Jayefuu2009-06-29

Stupid formatting. You get the picture :)

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Bosun Rick (author)Jayefuu2009-07-04

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

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kelseymh (author)2009-06-29

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

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Kiteman (author)2009-06-29

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.

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theRIAA (author)Kiteman2009-06-29

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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AndyGadget (author)2009-06-29

The volume of a cylinder the area of the base times the length (v = pi * r2 * l), so swapping this around a bit, the radius is 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 ;¬)

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Jayefuu (author)AndyGadget2009-06-29

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

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