It could be any irregular polygon other than a triangle.
rhombus
This is a parallelogram if it has 4 sides
Yes:As the shape is regular all sides are equal in length (and congruent).An octagon has 8 sides. As this is an even number of sides, the opposite sides are parallel.
Any shape with at least two straight sides can have opposite parallel and congruent sides. For example, a running track.
A square
rectangle
every parallelogram
Parallelogram, Rectangle, and Isosceles Trapezoid, opposite sides are congruent.
A kite
its a shape
A polygon with 2n sides (n>1) can have opposite angles congruent.
No. A trapezoid is a 4-sided flat shape with straight sides that has a pair of opposite sides parallel. The opposite angles not congruent.
A rhombus (4 congruent sides, diagonals perpendicular)that is not also a square (no right angles), andis also a parallelogram (opposite sides parallel and congruent, opposite angles congruent). It is also a quadrilateral, which has 4 sides.
a parallelogram.
This is a parallelogram if it has 4 sides
rhombus
Yes:As the shape is regular all sides are equal in length (and congruent).An octagon has 8 sides. As this is an even number of sides, the opposite sides are parallel.