How do I find the area of a circle?

1.The area of a circle can be found if the number pi (a number that is always 3.14) is multiplied by the radius squared (R ^ 2). i.e. S = 3.14 * R ^ 2
2.The area of a circle can be found by dividing pi by 4 (3.14 / 4) and multiplying by the diameter squared (d ^ 2). that is, S = 3.14 / 4 * d ^ 2



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