opposite angles of all parallelograms are always equal.
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All quadrilaterals apart from rectangles. Even parallelograms have adjacent angles that are not equal.
If one angle is right, then all angles are right. The diagonals of a parallelogram bisect each other. Opposite angles are congruent. Opposite sides are congruent. Consecutive angles are supplementary.
A parallelogram has opposite sides parallel and equal in length, and opposite angles are equal. Squares, rectangles and rhombuses are all parallelograms.
All rhombuses are paralleleograms. Rhombuses are parallelograms in which all four sides are the same length (and the opposite angles are congruent). Squares are rhombuses in which all four angles are right.
Similarities: Four Sides Opposite Sides are of equal length and parallel Differences All angles of a rectangle are 90 degrees while the parallelogram has angles which are supplementary (add up to 180 degrees). All rectangles are parallelograms while not all parallelograms are rectangles.