That would depend on what you mean by "five inch circle".
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The area of a circle with an 8 inch diameter is approximately 50.27 square inches.
The square because its perimeter is 16 inches while the circumference of the circle is 15.708 inches.
The area of a 3-inch diameter circle is about 7.068 square inches.
19.63 square inches are in the area of a 5-inch diameter circle.
Area of circle is pi*radius*radius. hence area of 1.5 inch circle is 7.065 square inches.