Basic Math: Geometry

Here are some important formulas from geometry:   Circumference of a circle: c = 2 (pi) r, where r = radius   Area: square: s2, where s = length of one side   circle: (pi) r2, where r = radius   sphere (surface): 4 (pi) r2, where r = radius   Volume: cube: s3, where s = length of one side   sphere: (4/3) (pi) r3 where r = radius   The Greek letter (pi) has the universally constant value of 3.14159... (3.14 is usually good enough). It was first derived by the Babylonians around 4000 years ago, and has recently been determined to an accuracy of a billion decimal places (yikes!)

Updated 8/16/99 By James E. Heath        Copyright Ó 1999 Austin Community College