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How Many Edges Does A Cylinder Have?

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Zero, there are NO edges on a cylinder, according to mathematical definitions (the answer is not two). 
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A cylinder has 2 edges
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No edges!
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It depends on how you define "edge". Some teachers define it as a straight line, so cylinders have no edges.

But if "edge" is defined as "a boundary between smooth surfaces" then a cylinder has 2 edges.

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