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Circles & Area

7.G.1Circumference01/03

Circumference of a circle.

Step01of 03

Two equivalent formulas, one using the radius, one the diameter.

C = 2 π r = π d

The constant $π \approx 3.14$ is the ratio of every circle's circumference to its diameter.

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7.G.1 – 7.G.3 · CCSS 7.G.B.4 / 7.G.B.6 · Full curriculum →