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Everything Geometry
Circles - Circumference
Students should be able to:
- identify and determine relationships among the radius, diameter, and circumference of a circle.
- use the formula for finding the circumference of a circle
Circumference
- The circumference is the perimeter of the circle, or the distance around the outside of a circle.
Click the button to trace the circumference of the circle.
Formula for Finding the Circumference of a Circle
The circumference of a circle is approximately 3.14 times the size of its diameter. We know the number 3.14 as Π, or pi. So the formula for finding the circumference of a circle is:
Since the diameter of a circle is twice as long as the radius, we can also use another formula:
More Geometry: Angles
| Basics of Geometry | Circles
| Classifying Quadrilaterals
| Classifying Triangles |
Area & Perimeter
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