How many square inches in a 25 diameter circle?

Answer 1

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

Answer 2

The area (A) of a circle is given by the formula A = πr2.

As the diameter = 25 inches, then the radius = 12.5 inches.

A = π x 12.52 = 490.87 sq inches.