Circle with Area 399.1916 Square Inches

Instant diameter calculation and visualization

Diameter

22.5448 inches

Radius

11.2724 inches

Circumference

70.8265 inches

Area

399.1916 in²

How to Calculate Circle Diameter from Area

Step-by-Step Solution

Start with the circle area formula: A = πr²
Solve for radius: r = √(A/π)
Calculate diameter: d = 2r


                            r = √(399.1916/π) = 11.2724 inches

                            d = 2 × 11.2724 = 22.5448 inches

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