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(2x-7)(2x-7) = area 4x2-28x+49 = area
A 7-by-9 grid has an area of 63 square units.
The surface area of a sphere with a radius of 7 is about 615.8 units2
The area of a regular pentagon with a radius of 7 is 10.1716. If the radius was 5, the area would be 7.26543.
The area of a 7-inch circle is: 38.48 square inches.