The volume of the cylinder is height * pi * radius squared.
Fill up the cylinder with water. Pour it into the irregular.
If it's not full yet, do it again as many times until it is.
Count how many times you filled & poured the entire cylinder full of water.
Multiply that number by the volume of the cylinder. (First part of answer)
If you can only fit a portion of the last cylinder full of water into the irregular, measure how much water you have left in the cylinder. Multiply (1-portion left (a fraction less than 1)) times the volume of the cylinder to get the volume of the last bit used to fill up the irregular. (second part of answer)
Add the two parts of the answer to get the final answer.
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To find the volume of an irregular object using a graduated cylinder, you can use the method of water displacement. Fill the graduated cylinder with a known volume of water, then carefully submerge the irregular object in the water. The increase in water level corresponds to the volume of the object. Subtract the initial volume from the final volume to determine the volume of the irregular object.
A graduated cylinder.
To find the volume of an irregular shape, you need to use the water displacement method. If the object can fit into a graduated cylinder, fill the cylinder with enough water to adequately cover the object, but don't put the object inside the cylinder yet. Record the amount of water in the cylinder. Carefully drop the object into the cylinder. This will cause a rise in the water in the cylinder. Record this second volume. Subtract the first volume from the second volume, and the difference is the volume of the irregular object. For larger objects, use an overflow can.
Find the density and mass of the object d=m/v and plug in your numbers and solve for volume
The diameter, alone, is not enough to find the volume of a cylinder. You need the height as well. > Where pi = 3.1416, and d = cylinder diameter cylinder volume = pi * (d/2)2 * length of cylinder