A trapezoid can have two parallel sides with none of them being 90°. An example would be an acute or isosceles trapezoid.
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none, the three sides meet so there are no parallel sides but all the sides are equal.
A nonagon can have none, or anything up to four pairs of parallel sides. You can even have two quartets of parallel sides in you allow concave nonagons.
An example of parallel lines are the two rails of a railway track, rails which never meet. An oval is a line or shape that has no parallel lines.
Ah, a regular heptagon is a special shape with seven sides. Each pair of opposite sides in a regular heptagon are parallel, so it has three pairs of parallel sides. Just imagine those lovely sides stretching out peacefully and evenly, creating a harmonious shape.
If all the sides are different lengths, it can only be called a quadrilateral. In general, four sided two dimensional objects are called quadrilaterals. When all four sides are the same length it is a square if all four corners are right angles. Otherwise it is a rhombus. If the opposite sides are the same length, it is a rectangle if the four corners are right angles, otherwise it is a parallelogram. In all these cases, the opposite sides are parallel to each other. There is also the trapezoid, a quadrilateral with only one pair of parallel sides. If the opposite sides are the same length but not parallel. it is an isosceles trapezoid.