A trapezoid can have two parallel sides with none of them being 90°. An example would be an acute or isosceles trapezoid.
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.
a sailboat like shape. draw two lines perpendicular to each other. then draw a line from the tip of each of the perpendicular lines. this should make one triangle. you have 2 90 degrees angles from the perpendicular lines and none of the 4 lines are parallel. you could imagine that one side is the diagonal side ofthe triangle. one side is the vertical line. and the two other sides are the horizontal line cut in two by the vertical line. altogether it is 4 sides.
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.
All polygons have the same number of sides as angles. So if there are 12 sides, thereare 12 angles.
A rhombus
this shape would be a rhombus
A rhombus or diamond.
None. A parallel is not a shape and so does not have any sides.
That would be a parallelogram, right.
No, because none of its 3 sides are parallel
None
A regular heptagon (or septagon, if you prefer) has seven equal sides and seven equal angles, and none of the sides is parallel to any other one. There is a bit more. There are an infinite number of other (irregular or non-regular) heptagons that may have at least one pair of parallel sides, and an infinite number that do not have any sides that are parallel.
square
Well, it is definitely a quadrilateral. It could be a parallelogram (both pairs of opposite sides are parallel), a rhombus (a regular parallelogram), a trapezoid (one pair of opposite sides is parallel), a kite (each pair of adjacent sides is congruent), or none of the above.
None. It is mathematically impossible.
none exist.