The circumference \((C)\) a circle is given by \(C = 2\pi r\), where \(r\) is the radius.

Complete the last two entries in the following table, giving your answers correct to two decimal places.

\begin{array}{|c|c|c|c|c|}
\hline \mathbf{r} & \mathbf{1} & \mathbf{1 . 5} & \mathbf{2} & \mathbf{2 . 5} \\
\hline \mathbf{C} & 6.28 & 9.42 & & \\
\hline
\end{array}