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Because the ratio of the circumference to the diameter of every circle is pi. So circumference = pi*diameter.

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Q: Why you are using pi to calculate circumference of the circle?
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How do you calculate circumference and area of pi?

Pi is the number of times the diameter of a circle will fit into the circumference. Pi is not a circle, and does not have a circumference or area. To calculate a circumference USING pi, the circumference is diameter * pi. To find the area using pi, area = pi * radius * radius


How do you calculate circumference of a circle using fractions as pi?

Pi is 22/7. Therefore, the equation for finding the circumference of a circle using fractions is: 22/7 mutiplied by the diameter of the circle :)


How do you calculate the circumference of a circle using the radius?

pi x (2xradius)


Pi can be used to calculate the blank of a circle?

Pi can be used to calculate the area of a circle Pi can be used to calculate the circumference of a circle


How do you calculate pi using divisibility?

Divide the circumference of any circle by its diameter and its quotient is equal to pi


How can you measure circumference?

The circumference of a circle can be measured by using the formula: C = 2πr, where C is the circumference and r is the radius of the circle. Simply multiply 2 times π (approx. 3.14) by the radius of the circle to calculate the circumference.


How do you calculate the circumfrerence of a circle?

Circumference of a circle = 2*pi*radius or pi*diameter


What do pi have to do with math?

you use pi to calculate the area or circumference of a circle


How do you calculate the area of a circle if you know the circumference?

By dividing its circumference by 2*pi will give the radius of the circle and its area = pi*radius2


Why do we use pi?

We use it to calculate the circumference of a circle.


How do you calculate the area from the circumference?

The area of a circle (A) is pi x r x r.The circumference of a circle (C) is pi x d, or pi x 2r.So if you know C, you can calculate r using the formula C = pi x 2r or r = C/2piOnce you know r, you can calculate A using the formula A = pi x r x r


How do you calculate the perimeter of a circle?

The perimeter or circumference of a circle = 2*pi*radius or pi*diameter