We assume the 7 inches is the diameter (D).
Area = Pi/4 * D2
Area = 0.7854 * 7 * 7 = 38.4845 sq.inches (rounded to 4th decimal).
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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 circle in square inches = pi*radius squared
Area of a circle = pi*radius2 inches
A 20-inch diameter circle contains: 314.16 square inches.