Pi is the basic foundation for finding the area of a circle. Just like with most shapes, if you find find the area of a circle, you can find the volume of it's 3D counterpart, as long as you know it's height.
ISAIAH LOPEZ
You might know that the formula for area of a circle is pi times the radius squared. Well, you can also find the volume of three-dimensional shapes that incorporate the formula as a part of their formula. To find the volume of a cylinder, it is the base of the cylinder, which should be a circle, times the height of the cylinder. To find the base of the cylinder, you would just use the formula πr² and then multiply that by the height. If you want to find out the volume of a cone, check out my other math widget on Volume for Slanted Surfaces.