To find the circumference of a circle, you can use the formula:
C = πd
where C is the circumference, π (Pi) is a constant approximately equal to 3.14, and d is the diameter of the circle.
In this case, the diameter is 40 inches. Plugging that into the formula, we get:
C = π × 40
Using 3.14 for π, we calculate:
C = 3.14 × 40 = 125.6
Thus, the circumference of the circle, rounded to the nearest tenth, is 125.6 inches.