Final answer:
To find the circumference of a circle using the diameters provided (17 km, 32 inches, 39 m, 25 mi), the formula C = πd is used with π approximated as 3.14, resulting in circumferences of 53.38 km, 100.48 inches, 122.46 m, and 78.5 mi respectively.
Step-by-step explanation:
The student is looking to find the circumference of a circle for various sizes. The formula to calculate the circumference is C = 2πr, where C is the circumference, π (pi) is approximately 3.14, and r is the radius of the circle. Since the diameter is twice the radius (d = 2r), we can use the diameters given in the question directly by applying the formula C = πd.
For the four given diameters, the circumferences are calculated as follows:
- a. 17 km diameter: C = 3.14 × 17 km = 53.38 km
- b. 32 inches diameter: C = 3.14 × 32 in = 100.48 inches
- c. 39 m diameter: C = 3.14 × 39 m = 122.46 m
- d. 25 mi diameter: C = 3.14 × 25 mi = 78.5 mi
Please note that these are approximate values using π as 3.14, and in practical scenarios, π can be considered up to several decimal places for more precision.