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The formula to calculate the area of a circle using radius is as follows: Area of a circle = π × r 2. And, to calculate the area of a circle using diameter use the following equation: Area of a circle = π × (d/2) 2. where: π is approximately equal to 3.14.
Learn how to calculate the area of a circle using the formula A = π r2 or A = (π/4) × D2. Use the online calculator to find the area, radius, diameter or circumference of a circle.
Calculate the area of a circle using its radius or diameter in various units. Learn the formula, examples and practical applications of circle geometry.
Learn how to calculate the area of a circle using the formula A = πr2, where r is the radius. See the derivation of the formula using rectangles and triangles, and examples of real-life applications of circles.
Learn how to calculate the area of a circle using the formula A = πr 2 or A = (π/4)d 2, where r is the radius and d is the diameter. See the derivation, real-world examples, and differences between area and circumference of a circle.
Learn how to calculate the area of a circle using the formula A = πr2, where r is the radius and π is the constant ratio of the circumference to the diameter. Explore the history, proofs, and properties of this geometric formula.
Learn how to calculate the area of a circle using its radius, diameter or circumference. See examples, formulas and tips for finding the area of a circle in different units.