What is an approximation of the circumference of the tunnel to the nearest kilometer? (pi is approximately 3.14)

Answer

The radius of the tunnel is given as r = 4.24 kilometers. The formula for the circumference of a circle is C = 2 * pi * r. First, we substitute the radius into the formula: C = 2 * pi * 4.24 = 8.48 * pi. To find the approximation of the circumference, we substitute pi with its approximate value of 3.14: C is approximately 8.48 * 3.14 = 26.6272. Rounding this value to the nearest kilometer gives 27.