Pentagon, or pentahedron if it's a 3-D figure rather than a plane figure.
A trapezium is a four sided figure with 2 sides parallel. None of its sides need to be equal in length.
None. Since the number of sides is odd, there can be no parallel sides.
None.
None. (As there are an odd number of sides, each side is opposite a vertex and there are no parallel sides.)
None. A 7-sided figure is a "heptagon." An 8-sided figure is an "octogon."
It can have none, one or two pairs.
A four-sided figure with no equal sides is an irregular quadrilateral.
None normally in a regular 5 sided pentagon but it is possible to construct an irregular pentagon with a pair of parallel sides.
None. A triangle based pyramid is a 4-sided solid (a tetrahedron), and has no parallel sides.
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.
There are no parallel sides in a right angle triangle
You are a rhombus.