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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?

165Views8Replies

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

## Discussions

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

Stupid formatting. You get the picture :)

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

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

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.}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."

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 ;¬)}Oooops. Thanks, I left PI out my calcs :D