The equation for the area of a circle is,
[tex]a = \pi \times {r}^{2} [/tex]
But first we need to find the radius. Simply divide the diameter by 2 to get the radius.
5 ÷ 2 = 2.5
So our radius in this case is 2.5 feet.
Substitute the number,
[tex]a = \pi \times {2.5}^{2} [/tex]
Solve for the square,
[tex]a = \pi \times 6.25[/tex]
A ≈ 19.63 ft^2
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I hope that helps you out!!
Any more questions, please feel free to ask me and I will gladly help you out!!
~Zoey