**Q: **Is cylinder understood to refer to a finite section of a right circular cylinder having a finite height with circular ends perpendicular to the axis as shown in the figure? ¶

**A: **Yes.

**Q: **Is cylinder defined more broadly as any ruled surface spanned by a one-parameter family of parallel lines? ¶

**A: **Yes.

**Q: **Is cylinder a degenerate quadric because at least one of the coordinates does not appear in the equation? ¶

**A: **Yes.

**Q: **Is cylinder made up the sum of all three components: top? ¶

**A: **Yes, and bottom and side.

**Q: **Is cylinder simply a cone whose apex is at infinity? ¶

**A: **Yes.

**Q: **Is cylinder the generalized cylinder: the cross-section can be any curve? ¶

**A: **Yes.

**Q: **Are cylinders also known as cylindroids? ¶

**A: **Yes, but that name is ambiguous, as it can also refer to the Plücker conoid.

**Q: **Is cylinder a three-dimensional region bounded by two concentric cylindrical sections and two parallel annular bases perpendicular to the cylinder's axis? ¶

**A: **Yes.