Circle Area Calculator
Calculate circle area using radius or diameter.
Enter radius to calculate area
Circle Area Formula Explained
The area of a circle is calculated using the mathematical constant π (pi) and the radius:
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Pi (π): A mathematical constant approximately equal to 3.14159
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Radius: The distance from the center to any point on the circle
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Square Units: The result is always in square units of your chosen measurement
A circle with a radius of 5 meters has an area of approximately 78.54 square meters (π × 5²).
Real-Life Uses of Circle Area
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Engineering: Designing circular components and calculating material needs
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Architecture: Planning circular spaces and calculating floor areas
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Manufacturing: Calculating material requirements for circular products
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Home Improvement: Measuring circular areas for flooring and paint
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Gardening: Planning circular garden beds and calculating soil needs
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DIY Projects: Creating circular designs and calculating material quantities
The circle area formula (π × r²) is one of the most fundamental formulas in geometry and is used extensively in various fields of science and engineering.
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