The diameter of an octagon with sides of 11 feet can take any value between 0 feet and 44 feet.
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11 ft diameter gives area = 95.03 sq feet (to 2 dp)
Assuming that the questions refers to the AREA of a CIRCLE with an 11 foot diameter, the answer is pi*(11/2)2 = 95.033 sq ft (to 3 dp).
V = 1,331 cubic feet.
The first ten polygons in order of names and sides are as follows:- Triangle has 3 sides Quadrilateral has 4 sides Pentagon has 5 sides Hexagon has 6 sides Heptagon has 7 sides Octagon has 8 sides Nonagon has 9 sides Decagon has 10 sides Undecagon has 11 sides Dodecagon has 12 sides
Area = pi*5.52 = 95.033 square feet to 3 d.p.