A hexagon.
A triangle. It has only three 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 regular hexagon has three sets (pairs) of parallel line segments that form it.
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
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.
hexagon
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.