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Geometry · G-C

Circle — Circumference and Area

Circumference = 2πr = πd; Area = πr². Both scale with the radius — circumference linearly, area quadratically.

GeometryCommon Core HSG-C.B.5G-CVerified correct ✓

Worked examples

Find the area of a circle with radius 6. Use π ≈ 3.14159. Round to 4 decimal places.
Answer: 113.097
Find the area of a circle with radius 9. Use π ≈ 3.14159. Round to 4 decimal places.
Answer: 254.469

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Area and Circumference of Circles

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