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Area of a circle

Area of a circle is calculated following the formula:
A = Π × r2
Where A = area of the circle, Π = Pi (Pi = 3.14; more about Pi below), and r = radius of the circle

Area of a circle

If the radius of a circle is 3 units then the area of the circle will be:
A = 3.14 × 32 = 3.14 × 9 = 28.26 square units

Π (Pi) - is a Greek letter used in Geometry to represent the ratio of the circumference of a circle to the diameter.