Ok, so if I have a square that is exactly 10 inches by 10 inches, then the surface area is 100 square inches exactly.(adsbygoogle = window.adsbygoogle || []).push({});

But if I roll up that square into a tube and calculate its surface area, it's 2∏r times the length. And since the calculation involves ∏, that means I won't get an exact answer. How is it that I get two different answers from calculating the surface area of two shapes that should have the exact same surface area?

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# Surface area of a square and a tube

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