2 because, imagine a CD it only has 2 sides so that's the same as a disk
Another View:1) There's the top, which goes from here to there.2) There's the underneath, which also goes from here to there.
3) Then there's the EDGE; it's also a side; which also goes from here to there, all the way around.
Some sides are flat; some sides are wavy; some sides a thin circle side.
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10 sides.
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
heptagons have 7 sides
8 sides
Four Sides.