The volume is read by looking at the top of the fluid from the side and reading the mark on the glass from the lowest portion of the lens-like meniscus of the liquid. R squared times pi times height 12 times 12 times pi times 20 144 times pi times 20 which is around 9048 meters squared. As a scientific instrument the graduated cylinder uses the metric system rather than the US.
Some pipets must be emptied to deliver the marked volume.
Learners view an explanation of how to read a graduated cylinder by measuring the lowest portion of the meniscus. The formula for the volume of a cylinder is height x p x diameter 2 2 where diameter 2 is the radius of the base d 2 x r so another way to write it is height x p x radius 2. Standard system so measurements are in milliliters instead of ounces. For accuracy the volume on graduated cylinders is depicted on scales with 3 significant digits.