Final answer:
The approximate area of a circle with a diameter of 18 in is 254 in².
Step-by-step explanation:
The area of a circle can be found using the formula A = πr², where A is the area and r is the radius.
In this case, the diameter of the circle is given as 18 in. Since the diameter is twice the radius, the radius is 18/2 = 9 in.
Using the formula, we can calculate the area: A = π(9 in)² ≈ 254 in².
Therefore, the approximate area of the circle is 254 in².