Because that then they would all be crumbled up into a triangle.
rectangle
If a set of equal sides are adjacent, then the quadrilateral is a "kite" shape. If a set of equal sides are opposite, then the quadrilateral is a parallelogram.
rhombus
rectangle
A parallelogram.
It is a 4 equal sided quadrilateral It has 2 equal opposite acute and 2 equal opposite obtuse angle Its opposite sides are parallel
A parallelogram is such a shape.
A kite.
A quadrilateral that has two sets of equal sides but is not a parallelogram is a kite. In a kite, two pairs of adjacent sides are equal in length, but the opposite sides are not parallel. This distinct property differentiates it from parallelograms, where opposite sides are both equal and parallel. Kites also have unique angle properties, such as one pair of opposite angles being equal.
A parallelogram.
A parallelogram is a quadrilateral with 2 pairs of parallel sides and a rhombus is a 4 sided figure (thus a quadrilateral) with all sides of equal length. Because opposite sides are of equal length opposite angles must also be equal. This angle measure defines a parallelogram.
A rhombus is a 4 sided quadrilateral that has 4 equal sides with 2 equal opposite acute angles and 2 equal opposite obtuse angles that all add up to 360 degrees.