Area of a circle calculator
The 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 pi = 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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Jul 20, 17 10:41 PM
A water tank is emptied at a constant rate. Initially, 36,000 gallons of water were in the tank. A the end of five hours, 16,000 gallons remained. How
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