Free online area of a circle calculator which helps you calculate the are of any circle, given its radius. Supports many different metrics such as in, ft, yd, mm, cm, meters, etc. Calculators Converters

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.

Learn how to calculate the area of a circle using the formula πr2, where r is the radius. See diagrams, examples, practice problems and an interactive applet to explore the relationship between radius and area.

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 = πd 2 /4, where r is the radius and d is the diameter. See the derivation, examples, and real-life applications of the area of a circle.

You can find the area of a circle using the radius, the diameter, or the circumference. To find the area using the radius, or the length from the center of the circle to the edge, use the formula area = πr^2, where r is the radius. For example, if the radius of the circle is 6 inches, first you would square 6 and get 36.

Calculate the area, circumference, radius and diameter of circles. Find A, C, r and d of a circle. Given any 1 known variable of a circle, calculate the other 3 unknowns. Circle formulas and geometric shape of a circle.

Learn how to calculate the area of a circle using radius, diameter or circumference. Find the formula, derivation, solved examples and practice problems on area of a circle.

Answer: The area of the circle is approximately 78.54 square units. Example 2. Problem: Calculate the diameter, circumference, and area of a circle with a radius of 10 units. Solution. Step 1: Calculate the Diameter. Use the formula for diameter: Diameter = 2 × Radius. Substitute the values: