circle
An equilateral shape would have equal and opposite sides.
it can be in any shape with even number of sides.
Rectangle
A parallelogram is a four sided shape where opposite sides are parallel and equal lengths. If you mean that ALL sides are equal lengths, you are looking for a rhombus.
This just means that opposite sides in a shape (sides that 'look' at each other) are of equal lengths.
an perticulogram
square + rectangle
A square has 4 equal sides with opposite angles that are equal.
trapizoid
polygon
A parallelogram
Shapes that do not have equal sides is called a quadrilateral. They include an irregular quadrilateral, rectangle, or a parallelogram.