Sand dollars are animals that live buried in the sand of shallow coastal waters. The thin circular body of a sand dollar is usually 2 to 4 inches wide. Find the area of a sand dollar that is 3 inches wide.

To determine the area of of the thin circular body given the diameter, use the equation, A = πd²/4.

Substituting the given diameter to the equation,

A = π (3²) / 4 = 9π/4

Thus, the area of the sand dollar is approximately 7.07 in².