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Area of a circle calculatorThe following area of a circle calculator will help you find the area of any circle when the radius is given. Just enter the value of the radius and hit calculate button. Recall that the formula to get the area of circle is pi × r2 with r = 3.141592653589793 Therefore, the area depends only on the size of r. That is why you only need to enter r here to get the area The calculator will only accept positive value for r since a distance cannot be negative As a reminder, if r = 3 cm for instance, area = 3.14 × 32 = 3.14 ×9 = 28.27 cm2  
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