There are: pi*42 = 50.265 square inches rounded to three decimal places
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A 4.75-inch diameter circle contains 17.72 square inches.
In a circle with a diameter of 4, there would be approximately 12.56 square inches in the circle.
A 1.25-inch diameter circle contains 1.227 square inches.
A 20-inch diameter circle contains: 314.16 square inches.
A circle with a diameter of 300 inches has an area of 490.87 square feet.