Math Is Fun Forum

Hrslvr1612

Member

Registered: 2005-12-12

Posts: 13

Help please!!

A cylindrical water bottle is 28 cm in diameter. how many centimeters does the water level drop when on liter is drawn off?

Please help!! thank you so much!!

John E. Franklin

Member

Registered: 2005-08-29

Posts: 3,588

Re: Help please!!

1000 / (196 pi)

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igloo myrtilles fourmis

Hrslvr1612

Member

Registered: 2005-12-12

Posts: 13

Re: Help please!!

I dont understand what you mean

John E. Franklin

Member

Registered: 2005-08-29

Posts: 3,588

Re: Help please!!

Okay, I just ate supper, but now I'm back.
1 CC is 1 ml, so 1000 ml = 1000 cubic centimeters.
A CC is about the size of a sugar cube.

The 196 comes from 14 times 14 because pi r squared is area of a circle.
So I divided 1000 milliliters (1 liter) by the circle area to get the height.
Units: cm cubed divided by cm squared is cm
3-D (cubed) divided by 2-D slice (the circle area) = height of cylinder.

Last edited by John E. Franklin (2006-04-16 11:43:26)

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igloo myrtilles fourmis

Hrslvr1612

Member

Registered: 2005-12-12

Posts: 13

Re: Help please!!

o ok thanks