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Circle Formulas

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Circle formulas, a selection of answers from the Dr. Math archives.

Circle Formulas - Dr. Math FAQ
From the Dr. Math Geometric Formulas FAQ: formulas for radius, diameter, circumference, area; arc, segment, and sector of a circle.

Circle Formulas: Area and Perimeter
I get confused by the different formulas, such as Pi r squared or Pi d.

Circle Area and Circumference
Are radius and diameter the same as area and circumference?

Finding the Area of a Circle
The formula, and how it works.

Finding the Circumference
Would you be able to tell me how to work out the circumference of a circle?

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Elementary Circles
Middle School Circles
Index of Selected Answers to Common Questions

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