The area of a circle calculator helps you compute the surface of a circle given a diameter or radius. Our tool works both ways — no matter if you're looking for an area-to-radius calculator …

It is interesting to compare the area of a circle to a square: A circle has about 80% of the area of a similar-width square. The actual value is ( π /4) = 0.785398... = 78.5398...%

2024年2月6日 · 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 …

2011年3月29日 · This article explains how to calculate the area of a circle in terms of pi (π) using a simple formula. Example problems with solutions are provided to help illustrate the process.

Use this area calculator to easily calculate the area of common bodies like a square, rectangle, triangle, circle, parallelogram, trapezoid, ellipse, regular octagon, and sector of a circle. …

The area of a circle is π multiplied by the square of the radius. The area of a circle when the radius 'r' is given is πr 2. The area of a circle when the diameter 'd' is known is πd 2 /4. π is …

2025年2月18日 · Read on to learn how to calculate the area of a circle using the radius, diameter, circumference, or even a sector of a circle. To find the area of a circle, use the formula A = π • …

The area of a circle is pi (approximately 3.14) times the radius of the circle squared. The circumference is pi times the diameter. You are here probably because you do not remember …

The formula for the area of a circle squares the radius and multiplies by π. The inverse process is used to find the radius from the area. Using π = 3۰142:

Use our simple calculator to find the area, circumference, diameter, and radius of a circle. Learn how to solve circle problems with our step-by-step guide.