Area and circumference of a circle.

By- Isabella Plumb

Example 1.

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What Is the area and circumference of a circle and why do we use it?

A circle is a shape with all points the same distance from the center. It is named by the center.


The circle to the left is called circle A since the center is at point A. If you measure the


distance around a circle and divide it by the distance across the circle through the center, you will always come close to a particular value,


depending upon the accuracy of your measurement. This value is approximately 3.14159265358979323846... We use the Greek letter to represent this value. The number


goes on forever.

Circumference

The distance around a circle is called the circumference. The distance across a circle through the center is called the diameter.


Pi is the ratio of the circumference of a circle to the diameter.


for any circle, if you divide the circumference by the diameter, you get a value close to Pi. This relationship is expressed in the following formula:

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Citation

"Circumference". Mathgoodies.com. N.p., 2016. Web. 10 May 2016.
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PI = 3.14

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