The formula to calculate the area of a circle using radius is as follows: Area of a circle = π × r2. And, to calculate the area of a circle using diameter use the following equation: Area of a circle …

See How to Calculate the Area below, but first the calculator: Enter the radius, diameter, circumference or area of a Circle to find the other three.

Oct 29, 2025 · To find the area of a circle, use the formula A = π • r2, where r is the radius of the circle. If you only know the diameter of the circle, then use the formula A = π • (d/2)2 where d …

Oct 25, 2023 · The area of a circle can be calculated using three different formulas. The formulas are used based on whether the radius, diameter, or circumference is known to us.

Alternatively, the space occupied within the boundary/circumference of a circle is called the area of the circle. The formula for the area of a circle is A = πr 2, where r is the radius of the circle. …

May 8, 2024 · This free Step-by-Step Guide on How to Find the Area of a Circle will teach you how to use the circle formula, A=πr², to find area of a circle and it will cover the following …

Apr 29, 2025 · Learn how to calculate the area of a circle with step-by-step examples. Includes formulas, derivation, practical applications, and practice problems...

Jul 2, 2025 · Calculate the area of a circle using radius or diameter, with an optional custom π value. Formulas: A = π × r² or A = π × (d ÷ 2)².

Jun 9, 2025 · Learn how to find the area of a circle with clear formulas, step-by-step examples, and visual explanations—perfect for students and math learners of all levels.

Aug 1, 2025 · Use this circle calculator to find the area, circumference, radius or diameter of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three …