None
A triangle can have no parallel lines.
A pentagon has no parallel lines.
A cube has exactly 6 parallel lines.
A cube has exactly 6 parallel lines.
Two lines tangent to a circle at the endpoints of its diameter are parallel. See related link for proof.
Parallel lines within a circle are infinite.
A circle does not have a set of parallel lines in the traditional sense, as parallel lines are defined as lines that never intersect and remain equidistant from each other. However, you can draw lines that are tangent to a circle at various points, and these tangent lines can be parallel if they are at the same distance from the center of the circle. But in the context of the circle itself, it does not contain parallel lines.
No, parallel lines are straight lines.
a circle
No. The circular shape makes it impossible to have parallel lines just as you cannot have parallel lines in a circle that both reach the length of the diameter of the said circle.
no
circle
The two points on exactly opposite sides of a circle are parallel to each other. This can be evidenced by finding the derivative/gradient at those points; if they are the same then the two line segments described by those points are parallel.
Cdm
Yes it does
lines of latitude
None.