If you have a liquid in a cylinder and are wondering how much space it is taking up, you may want to figure out the volume. To figure the volume of a cylinder, you will need to know the height and radius of the circular end of the cylinder. You will then use the formula volume equals pi times r^2 times height.
Pi is equal to approx. 3.142. You can find more information here: mathopenref.com/cylindervolume.html.
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