Parallelograms are a special type of quadrilateral where opposite sides are parallel and equal in length. The following types of quadrilaterals are classified as parallelograms:
- Rectangle: A parallelogram with all angles equal to 90 degrees.
- Rhombus: A parallelogram where all sides are of equal length.
- Square: A parallelogram that is both a rectangle and a rhombus, having equal sides and all right angles.
To summarize, rectangles, rhombuses, and squares are all types of parallelograms due to their properties of having opposite sides that are both equal and parallel.