Final answer:
To calculate the circumference of circles with diameters of 17 km, 32 inches, 39 m, and 25 mi, we use the formula C = πd, resulting in circumferences of 53.38 km, 100.48 inches, 122.46 m, and 78.5 mi respectively.
Step-by-step explanation:
Calculating the Circumference of a Circle
To find the circumference of a circle, we use the formula 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 also use C = πd.
Given the diameters provided:
- a. 17 km
- b. 32 inches
- c. 39 m
- d. 25 mi
We will calculate the circumference for each:
- 17 km: C = 3.14 * 17 = 53.38 km
- 32 inches: C = 3.14 * 32 = 100.48 inches
- 39 m: C = 3.14 * 39 = 122.46 m
- 25 mi: C = 3.14 * 25 = 78.5 mi
The resulting circumferences are given with two significant figures to match the precision of the diameters provided.