How many flat surfaces has the cylinder?

Answer 1

A cylinder has 2 flat surfaces and 1 curved surface.

In differential geometry, a cylinder is defined more broadly as any ruled surface spanned by a one-parameter family of parallel lines. As such it can have any number of flat surfaces but need not have any at all. A cylinder whose cross section is an ellipse, parabola, or hyperbola is called an elliptic cylinder, parabolic cylinder, or hyperbolic cylinderrespectively; these have no flat surfaces.

Answer 2

2

Answer 3

4

Answer 4

0

Answer 5

1