MATHEMATICAL FORMULAS Sometimes it's just a matter of some simple math to figure out the area or volume of a piece that will help you. If that's the case we offer the following basic formulas to determine the area or volume of some of the more common shapes. AREAS: Shape: Formula: Triangle base times height divided by two Rectangle a times b, where a and b denotes the length of the sides (for a square a and b are equal) Circle pi times radius squared(pi=3.14159) Cube 6 times a squared (a=length of side) Sphere 4 pi times the radius squared(pi=3.14159) Cylinder height times circumference (does not include ends, use circle formula for ends) Volumes: Shape: Formula: Cube a times b times c (a,b and c equal the length, depth and height) Sphere 4/3 pi times radius cubed(pi=3.14159) Tetrahedron .11785 times length of edge (for equilateral tetrahedron) Pyramid area of base times height divided by Cone area of base times height divided by three Cylinder area of base times height