Mathematics ACT Aspire Practice Test

To determine the circumference of a circle, you can use the formula:

\[

C = \pi \times d

\]

where \( C \) is the circumference and \( d \) is the diameter of the circle. Given that the diameter is 10, you can substitute this value into the formula:

\[

C = \pi \times 10

\]

Using the approximate value of \( \pi \) as 3.14, the calculation becomes:

\[

C \approx 3.14 \times 10 = 31.4

\]

Rounding this to two decimal places gives approximately 31.42. This value corresponds to one of the choices provided.

Thus, the answer is accurate and reflects the proper use of the circumference formula using the given diameter.