IN MATH: 1. n. the ratio of a circle's circumference to its diameter (symbol is ). EX. The area formula for a circle states: , area equals the product of pi and the square of the radius. EX. When written as a decimal, is nonterminating. One decimal expression for

is 3.14159265358979323846264338327950288419 71693993751058209749445923078164062...