It is Pi/4 x diameter squared.
That is 0.7854 x 5 x 5 = 19.635 square inches.
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The area of a circle with a 5-inch diameter is: 19.63 square inches.
The area of a 5-inch circle is: 19.6 square inches.The area of a 4-inch circle is: 12.6 square inches.The area of the 5-inch circle is 55.6% larger than the 4-inch circle
force = pressure x area = 2000 x 5 = 10,000 pounds
The area of a 14-inch circle is: 153.9 square inches.
A 10.5-inch circle has an area of 86.59 square inches.