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17 February, 15:02

Suppose that a circular coin has an area a, a radius of r, and a diameter of

d. write a as a function of

d.

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Answers (1)
  1. 17 February, 15:06
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    The area of a circle is A = pi * r^2

    The radius is half of the diameter, r = (1/2) d

    Replace r in the formula with the expression with d

    A = pi * ((1/2) d) ^2

    A = pi * 1/4 * d^2

    A = (pi * d^2) / 4
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