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Circle Calculator
Comprehensive circle calculations
From Radius
From Diameter
From Circumference
From Area
Enter Radius
Calculate all circle properties from radius
Radius
Results
Diameter
0.00 units
Circumference
0.00 units
Area
0.00 sq units
Circle Formulas Reference
Basic Formulas:
• Diameter = 2 × radius
• Circumference = 2 × π × radius
• Area = π × radius²
Derived Formulas:
• Radius = diameter ÷ 2
• Radius = circumference ÷ (2π)
• Radius = √(area ÷ π)