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outside my school. The tanks are cylindrical, which would be no

problem if they were standing on end, but they're not, they're lying

on their sides.

xx

x x

x----------x -Liquid level which is variable,

x x can go up or down

x x

x x

x x

xx

Imagine the above is a circle. I know the diameter of the circle,

and I can measure from the top of the circle down to the liquid level.

How can I use this information to derive the amount of liquid in the

circle? I hope to make a formula I can use in a spreadsheet.

Thanks so much.