if the perimeter of 1/4 of the circle is 7.14, then the full circle is 4(7.14) = 28.56.
[tex]\bf \textit{circumference of a circle}\\\\ C=2\pi r~~ \begin{cases} r=radius\\ \cline{1-1} C=28.56 \end{cases}\implies 28.56=2\pi r \\\\\\ \cfrac{28.56}{2\pi }=r\implies 4.55\approx r[/tex]
and the radius is the same on any location of the circle.
