Question

This problem was solved incorrectly. Circle the mistake in the work/answer, explain what the mistake is, and find the correct answer. Use 3.14 for pi and round to the nearest hundredth if necessary

Answer 1

The mistake was that when substituting in the value for d, the student used the value for the radius instead.

For this to be correct, they should double the value of the radius (so do 5.1 × 2) to give them 10.2, and then work out the question:

C = π × d

C = 3.14 × 10.2

C = 32.028 ≈ 32.03 m (rounded to the nearest hundredth)