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From the formula, what is r?

By Lee Mansfield on the 11th of June, 2012

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As a standard practice in mathematics, usually the variable "r" represent the radius of a Circle.

This is half of the diameter (d).

We can say r=d/2 , where d is diameter of a circle.

By madhuchaliyan on the 17th of January, 2013

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In all the mathematical representations r represens radius, ie the radius of a cirlce.

By Adersh Antony on the 19th of January, 2013

Solve problems involving perimeters and areas of circles

circle is a shape where every point on its edge is the same distance from the centre.

The distance from the centre to the edge of the circle is called the Radius.

The distance from one side of the circle to the other, going through the centre, is called theDiameter. This is also double the length of the Radius.

π (pronounced Pi) is a special number that is calculated by dividing the circumference of a circle by the diameter. No matter what size circle you have, this number always stays the same. In reality, this number is never ending, but we can approximate it to 3.14, but to make it easier for us, since this number never changes, we just call it Pi and write it π.

The circumference of a circle is just another way of saying the perimeter of a circle, the distance around the edge of a circle.

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