[tex]\begin{gathered} C=2\cdot\pi\cdot r \\ \\ A=\pi\cdot r^2 \end{gathered}[/tex]
r is the radius.
For the given circle:
[tex]\begin{gathered} C=2\cdot3.14\cdot5yd \\ C=31.4yd \\ \\ \\ A=3.14\cdot(5yd)^2 \\ A=3.14\cdot25yd^2 \\ A=78.5yd^2 \end{gathered}[/tex]
