Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to calculate the volume of a cylinder [title] Find the radius of the circular base. [step] Either circle will do since they are the same size. If you already know the radius, you can move on.

Ending1: If you don't know the radius, then you can use a ruler to measure the widest part of the circle and then divide it by 2. This will be more accurate than trying to measure half of the diameter. Ending2: If you don't, skip to the next step in your problem. [substeps] Ohm's law states that any coiled cylinder moves from one side to the other, no matter what you're doing. Ending3: If you don't know the radius, you can easily find it with the formula " squared ". If it is multiplied by its radius, go down to the calculator again and make an approximate amount. Ending4: [title] Find the volume of your cylinder using the radius of the cylinder (term used for an object that rotates or moves around often). [title] Calculate the volume of your cylinder by narrowing it down to that radius.

Answer format: ending1/ending2/ending3/ending4