>I don't think you read my post very well. I was not comparing square inches to inches. I do know the difference. .0016 was the square of the radius, not square inches.
If the radius is measured in inches, then square of the radius has units of square inches. The fact that you have to multiply the square of the radius times pi to get the actual area is irrelevant, because pi is unitless.
When calculating any algebraic formula, it's necessary to include the units in the calculation. This is a point missed in algebra and geometry textbooks, but it's absolutely critical in engineering and science. And it's something we do every day without thinking about it, when we calculate bushels per acre or miles per gallon, etc.
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