Infinitely many. Polygons with 6 or more sides can have 3 pairs of parallel lines. Polygons with 7 or more sides can have a set of three parallel lines.
A trapezoid has four sides, one set is parallel.
Do you mean a trapezoid? If so it has 4 sides and 1 set of parallel . ( 2 lines are parallel ) .
9
No, it can be a triangle intersecting a set of three faces which meet at one vertex.
A polygon does not have a set number of sides.
Beryl does not have a set amount of sides.
Infinitely many. Polygons with 6 or more sides can have 3 pairs of parallel lines. Polygons with 7 or more sides can have a set of three parallel lines.
A trapezoid has four sides, one set is parallel.
There are infinitely many triplets, and in general, they do not have a name. If all three are integers, then they are known as Pythagorean triplets.
A polygon can have any amount of sides - three or more, that is. There is a lovely Wikipedia page on polygons, it can help with any other polygon questions you may have: http://en.wikipedia.org/wiki/Polygon
This is a bogus/ an impossible question to answer mathematically, as firstly, you would need a data set of people with cubes in a hand, the size of the cubes is unknown, etc.
A beryl typically has 6 sides, known as facets, due to its hexagonal crystal structure.
Do you mean a trapezoid? If so it has 4 sides and 1 set of parallel . ( 2 lines are parallel ) .
8 subsets
A trapezium. It has one set of parallel sides. It has four sides.
Three