<Li> Parallelogram : a quadrilateral with two pairs of parallel sides . Equivalent conditions are that opposite sides are of equal length ; that opposite angles are equal ; or that the diagonals bisect each other . Parallelograms include rhombi ( including those rectangles we call squares ) and rhomboids ( including those rectangles we call oblongs ) . In other words , parallelograms include all rhombi and all rhomboids , and thus also include all rectangles . </Li>
<Li> Parallelogram : a quadrilateral with two pairs of parallel sides . Equivalent conditions are that opposite sides are of equal length ; that opposite angles are equal ; or that the diagonals bisect each other . Parallelograms include rhombi ( including those rectangles we call squares ) and rhomboids ( including those rectangles we call oblongs ) . In other words , parallelograms include all rhombi and all rhomboids , and thus also include all rectangles . </Li>
quadrilateral with 2 pairs of equal sides and 2 pairs of opposite angles that are equal
quadrilateral with 2 pairs of equal sides and 2 pairs of opposite angles that are equal
Parallelogram
Parallelogram