Because of the radius of the circle
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Pi is used in many different places.The most obvious one is to calculate several things related to circles and spheres: for example, calculate the circumference and the area of a circle if you know the radious, or calculate the surface area and the volume of a sphere if you know the radious.Pi is also used in certain situations where there is no connection to circles. For example, in certain integrals (to calculate the area under certain functions).Pi is used in many different places.The most obvious one is to calculate several things related to circles and spheres: for example, calculate the circumference and the area of a circle if you know the radious, or calculate the surface area and the volume of a sphere if you know the radious.Pi is also used in certain situations where there is no connection to circles. For example, in certain integrals (to calculate the area under certain functions).Pi is used in many different places.The most obvious one is to calculate several things related to circles and spheres: for example, calculate the circumference and the area of a circle if you know the radious, or calculate the surface area and the volume of a sphere if you know the radious.Pi is also used in certain situations where there is no connection to circles. For example, in certain integrals (to calculate the area under certain functions).Pi is used in many different places.The most obvious one is to calculate several things related to circles and spheres: for example, calculate the circumference and the area of a circle if you know the radious, or calculate the surface area and the volume of a sphere if you know the radious.Pi is also used in certain situations where there is no connection to circles. For example, in certain integrals (to calculate the area under certain functions).
Pi can be used to calculate the area of a circle Pi can be used to calculate the circumference of a circle
pi times diameter = circumference
The word "circumference" is used for circles and circular shapes, such as ellipses and ovals. For other plane shapes, the word used is perimeter.
Since pi is the ratio of the circumference of any circle to its diameter, it comes up any time a radius or diameter is used to calculate most other characteristics of a circle or a sphere, such as circumference, area, surface area or volume, or whenever any of those characteristics are used to calculate a radius or diameter.