Area of a circle

Area A = π x r²

with π (number pi) approximately equal to 3.14 Radius = AO = OB = r Diameter = AB = 2 r Example Take a circle with radius r = 5 cm Area A of the circle = π x r² ≈ 3.14 x 5² ≈ 78.5 cm² Calculate the area of a circle Radius Area of the circle