Pi (denoted
) is the mathematical constant that is equal to the ratio of a circle's circumference to its diameter. In algebraic terms:
The value of pi works out to be an irrational, non-terminating decimal. It is approximately equal to 3.141593 in decimal form and 22/7 in fraction form.
Pi is a value that will show up again and again in mathematics. Just a few examples are:
Area of a Circle =
r
2
Volume of a sphere = (4
r
3)/3
Circumference of a Circle = 2
r