Circle Area Calculator
This free online calculator will help you to find the area of a circle, when you know the langth of circle radius or circle diameter.
Using this online calculator, you will receive a detailed step-by-step solution to your problem, which will help you understand the algorithm how to find circle area.
Calculation of Circle Area
Select defined data
Input length of circle radius:
Entering data into the circle area calculator
You can input only integer numbers or fractions in this online calculator. More in-depth information read at these rules.
Theory. Circle Area
Circle is a simple shape consisting of those points in a plane that are equidistant from a given point, the centre. The distance between any of the points and the centre is called the radius.
The formulas for calculating of circle area:
where A - circle area,
r - circle radius,
d - circle diameter,
π = 3.141592.
You can input only integer numbers, decimals or fractions in this online calculator (-2.4, 5/7, ...). More in-depth information read at these rules.
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