Final answer:
The length of the circumference of an 18-inch circle is approximately 56.52 inches.
Step-by-step explanation:
The length of the circumference of a circle can be found using the formula C = 2πr, where C is the circumference and r is the radius of the circle.
In this case, the radius of the circle is 18 inches. Thus, the length of the circumference is:
C = 2π(18) = 36π inches.
Since we want the length of the circumference in inches, we can use the approximation π ≈ 3.14. Therefore, the length of the circumference is approximately:
C ≈ 36 × 3.14 = 113.04 inches.
Therefore, the correct answer is D) 56.52 inches.