Respuesta :
[tex]\bf \textit{circumference of a circle}\\\\
C=2\pi r\quad
\begin{cases}
r=radius\\
-----\\
C=28.26
\end{cases}\implies 28.26=2\pi r\implies \cfrac{28.26}{2\pi }=r
\\\\\\
\cfrac{14.13}{\pi } =r[/tex]
now, that's just the radius, recall the radius is half the diameter, so the diameter is twice as much as the radius, so the diameter is two times that much.
now, that's just the radius, recall the radius is half the diameter, so the diameter is twice as much as the radius, so the diameter is two times that much.
