Because the ratio of the circumference of any circle to its diameter is pi.
Pi can be used to calculate the area of a circle Pi can be used to calculate the circumference of a circle
By definition Pi is the relation between the radius and circumference of a circle.
It is used to find the area of a circle as pi*radius2
Pi is used to find area and circumference of a circle.
the way to use pi is to find the circuference of a circle
Pi can be used to find a circle, For the circumference-Pi x D, or for the radius Pi x r2
To find out the area of a circle.
It is a Greek letter used to represent the ratio of the diameter of a circle to its circumference so you can see 'pi' (not a pi)in any circle.
Area of a circle equals pi (3.14) times the radius squared.
well pi is used to find the area of a circle A=pi x the radius squared
Pi is used in nearly every branch of math. If you need to do anything with a circle, pi was used to make that circle. Any measurement of a circle, cylinder, sphere, etc involves pi. Pi is incorporated into the GPS. All kinds of things use pi. A fun fact for pi: the actual length of a river compared to the straight distance from source to mouth will yield pi.
pi is the # 22 divided by 7. it is used to find a circle's circumfernce