[b][color=#000000]Definition of [/color][/b][math]\pi[/math][color=#000000][b]:[/b] [/color] [br][math]\pi[/math] is the number of diameters that wrap perfectly around any circle. [br][br]The circumference of a circle is equal to the number of diameters that wrap around the circle[br]times the length of each diameter. Thus, [math]C=\pi\cdot d[/math]. [br]