Question

why we use π in formula of circle 

Answer 1

The distance around a circle is called its circumference. The distance across a circle through its center is called its diameter. We use the Greek letter  (pronounced Pi) to represent the ratio of the circumference of a circle to the diameter.  we learned that the formula for circumference of a circle is: . For simplicity, we use  = 3.14. We know  that the diameter of a circle is twice as long as the radius. This relationship is expressed in the following formula: .

Answer 2

Because it is the ratio of Circumference of a circle to its diameter.

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