A cylinder has one closed "cylindrical" (circular) surface and two circles at each end.
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A cylinder has 2 opposite parallel flat surfaces.
A cylinder has three faces and two round surfaces.
There are 2 flat surfaces, both are circles.
Three: top, bottom, and middle
There are infinitely many equations for each - and they are of different form, depending on the shape of the curve etc.
1
A cylinder has 2 opposite parallel flat surfaces.
A cylinder has two circular faces.
A cylinder has three faces and two round surfaces.
A cylinder has 2 flat surfaces.
2
There are 2 flat surfaces, both are circles.
A cylinder has two circular faces.
2 flat and 1 curved
Two. The ends.
Three: top, bottom, and middle
0 vertices 0edges 2 flat surfaces