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.

Question

Jamarcus Fischer

Mathematics

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.

+1

Answers (1)

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Nathaly Pitts · Answer 1

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

Suppose that a circular coin has an area a, a radius of r, and a diameter ofd. write a as a function ofd.

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.