Diameter is 10, circumference is about 31.416 and area is about 78.540 square units.
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Circle Calculator
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Circle measurements details
Formula & disclaimer
Diameter = 2r; Circumference = 2Οr; Area = ΟrΒ²
View assumptionsFormula reviewCalcs at Hand Editorial TeamVerified 31 August 2026 Β· automated checks included
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How to read this result
Three useful checks, kept deliberately short.
A circle with radius 5: Double the radius for diameter Β· Multiply 2Οr for circumference Β· Multiply ΟrΒ² for area.
When area is entered, length outputs use the corresponding square-root unit.
Formula and assumptions
Diameter = 2r; Circumference = 2Οr; Area = ΟrΒ²All length outputs use the same unit as the entered length.
Keep in mind: Retain additional precision when using the output in later calculations.
Produced byCalcs at Hand Editorial Team
Last formula check31 August 2026
Review methodKnown examples + boundary cases
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