A good place to measure is the diameter of the circular end. That gives you
the area of the circular end, and the only other number you need in order
to calculate the cylinder's volume is its straight length.
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To find the volume of an object, we use an overflow cylinder as it gives a measure of the volume of the object by displacing an equal amount of water into the beaker.
Volume of cylinder: base squared times length
v=l*b
Volume displacement is a good way to find the volume of a cylinder, and is probably better than simply measuring it. To measure and calculate a cylinder's volume, you must use pi, which is typically rounded to 3.14. Rounding means less accuracy, and there should be no rounding involved in volume displacement.
To find the mass and volume of an object, you need to use a measuring device. For example, you can use a balance to measure the mass of the object and a graduated cylinder to measure its volume. Once you have these measurements, you can record the mass as 50 grams and the volume as 5 milliliters.