A hexagon.
A triangle. It has only three sides!
A hexagon, which has six sides, can have parallel sides depending on its specific type. In a regular hexagon, there are three pairs of parallel sides. However, in irregular hexagons, the number of parallel sides can vary. Thus, the answer can range from zero to three pairs of parallel sides.
A cube would fit the given description
Angle
A triangle cannot have two parallel sides. In order for a figure to be a triangle, it must be a closed figure with three sides and three angles. If two of the sides were parallel, there is no way the figure could be closed by only one other line.
A triangle. It has only three sides!
You are a hexagon...
A regular hexagon has 6 parallel sides (3 pairs)
A cube would fit the given description
no
A cube has three pairs of parallel faces and all faces are congruent.
An octagon can have 0, 2, 3, 4, 5, 6, 7 or 8 parallel sides. A regular octagon has 4 pairs of 2 parallel sides, (8 parallel sides in all).
Angle
hexagon
A parallelogram is, conventionally, a four sided figure with two sets of parallel sides and four interior angles. Some people argue that hexagons (with three pairs of parallel lines), octagons (4 pairs) and, generally, 2n-gons with n pairs of parallel sides should also be considered parallelograms.
Providing that it is a regular 6 sided hexagon then it will have 3 pairs of opposite parallel sides. Though an irregular hexagon (shaped as the outline of an L) can have 2 sets of three parallel sides.
A triangle cannot have two parallel sides. In order for a figure to be a triangle, it must be a closed figure with three sides and three angles. If two of the sides were parallel, there is no way the figure could be closed by only one other line.