I'm not completely sure what a "2.5 inch circle" is.
Is that the distance all the way across the circle (diameter), or is it
the distance from the center of the circle to its curve (radius) ?
If diameter = 2.5 inches, then area = 4.909 square inches
If radius = 2.5 inches, then area = 19.635 square inches
A 1.25-inch diameter circle contains 1.227 square inches.
The area of a circle with an 8 inch diameter is approximately 50.27 square inches.
A 4.75-inch diameter circle contains 17.72 square 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 in square inches = pi*radius squared
Area of circle is pi*radius*radius. hence area of 1.5 inch circle is 7.065 square inches.
Area of a circle = pi*radius2 inches
There are 100*pi square inches in a 20 inch diameter circle
70.9 square inches.
Approximately 7.068 square inches.
That would depend on what you mean by "five inch circle".