Diameter is double the size of radius so
[tex]\begin{gathered} \text{Diameter = 2 Radius} \\ \text{Radius}=\frac{Diameter}{2} \end{gathered}[/tex]From the given expression we have,
Radius = 2.6 feet
substitute the value of Radius
[tex]\begin{gathered} \text{Diameter = 2}\times2.6 \\ \text{Diameter = 5.2fe et} \end{gathered}[/tex]So, the diameter is 5.2 feet
Answer : 5.2 feet