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The radius of the circle is half of the diameter, so it is 10ft/2 = 5ft.
The formula for the area of a circle is A = πr^2, where A is the area and r is the radius.
Plugging in the radius, we get A = π(5ft)^2 = π(25ft^2) = 25π ft^2.
Therefore, the area of the circle is 25π ft^2.