Area of circle in square inches = pi*radius squared
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A 1.25-inch diameter circle contains 1.227 square inches.
A 4.75-inch diameter circle contains 17.72 square inches.
Area of a circle = pi*radius2 inches
A 20-inch diameter circle contains: 314.16 square inches.
A 36-inch diameter circle has an area of: 1,017.9 square inches.* * * * *which is 7.07 square feet.