A square is one of them.
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A parallelogram with equal sides is always a rhombus, and it may also be a square.
A parallelogram is in the class of 4 sided quadrilaterals
Not necessarily. All parallelograms are quadrilaterals but not all quadrilaterals are parallelograms. Parallelograms are more specific instances of quadrilaterals. Its like saying all squares are rectangles but not all rectangles are squares.
It's not possible to have all sides parallel. The quadrilaterals that have every side parallel to the one opposite it ... or two pairs of parallel sides ... are: -- parallelograms -- rhombera -- rectangles -- squares Notice that -- every square is also a rectangle, a rhombus, and a parallelogram. -- every rectangle is also a parallelogram. -- every rhombus is also a parallelogram.
A parallelogram has two diagonals the same as all 4 sided quadrilaterals