12 in = 1 ft
→ 11.5 in x 11.5 in = (11.5 ÷ 12) ft x (11.5 ÷ 12) ft
≈ 0.918 sq ft
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When you say the circle is 115-ft "wide", we have to assume thatyou're talking about the circle's diameter.Area of a circle = (pi) x (R2)R = radius = 1/2 of the diameter1 acre = 43,560 square feetArea of circle with 115-ft diameter = (pi) x (57.5)2 square feet = 0.2385 acre (rounded)
18-ft x 11-ft = 198 square ft
960 sq. ft.
16-ft x 70-ft = 1,120 square feet
650 square ft.