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2 days ago · Diameter = 2 × Radius. mega slot bonus code The formula to calculate the area of a circle using radius is as follows: Area of a circle = π × r2 And, to calculate the area of a circle using diameter use the following equation: Area of a circle = π × (d/2)2 where: π is approximately equal to 3 14 It doesn't matter whether you want to find the area of a