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HallsofIvy posted "1: You titled this "differentiation of a circle" which makes no sense. You cannot differentiate a geometric figure!"

I'm dearly sorry for needing to ask this. It's been years and years that I'm out of school. The terms are all new for me again, but I should hope that I haven't gotten any stupider with time! Can we explain it to me like a kid? With really easy English?