A cylindrical barrel has a diameter of 18

inches. Which of the following is the best estimate

of the circumference of the barrel in feet?

A. 10 ft

B. 2 ft

C. 5 ft

D. 1 ft

C. 5 ft

Step-by-step explanation:

The diameter is 18 inches. Lets change that to feet

1 ft = 12 inches

18 inches * 1 ft/12 inches = 1.5 ft

The circumference is given by

C = pi * d

C = 3.14 * 1.5

C = 4.71 ft

C. 5 ft

Step-by-step explanation:

Radius = 18/2 = 9 in : 12 = 0.75 ft

Circumference = 2 * 3.14 * 0.75

= 4.71 ft

From the options, 5 ft is the closest