**Area of a Circle Calculator**
https://www.gigacalculator.com/calculators/area-of-circle-calculator.php

Area of a circle formula. The formula for the area of a circle is π x radius 2, but the diameter of the circle is d = 2 x r 2, so another way to write it is π x (diameter / 2) 2. Visual on the figure below: π is, of course, the famous mathematical constant, equal to about 3.14159, which was originally defined as the ratio of a circle's circumference to its diameter.

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