## Definition Of Pi

The ratio of the circumference of a circle to its diameter is known as "Pi".

The 16th letter of the Greek alphabet.
It is symbolically represented as π.
The value of pi is  or approximately equal to 3.14159.
Pi is an irrational number.

### Examples of Pi

According to the definition, Pi = Circumference/Diameter which is shown in the figure i.e. π = C/d, where C is the circumference of the circle and d is its diameter.

A. 14π cm
B. 16π cm
C. 18π cm
D. 20π cm