Final answer:
The expression that best represents the value of pi in terms of the circumference of a circle is C/19.
Step-by-step explanation:
The circumference of a circle is given by the formula C = πd, where C is the circumference and d is the diameter. In this case, the diameter is given as 19 inches. So, the circumference is C = π * 19. To find the value of π, we need to isolate it in the formula. Dividing both sides of the equation by 19, we get C/19 = π.
Therefore, the expression that best represents the value of π in terms of the circumference is option 1) C/19.