Yes all rectangles are parallelogram but all parallelogram cannot be rectangles.
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A parallelogram is a figure with parallel sides. For instance, a square is a parallelogram because its sides are parallel.
Rectangles form a subset of parallelograms. It has four sides comprising two pairs of parallel sides.
A parallelogram is a quadrilateral, which has 2 pair of parallel sides. Squares, rhombuses and rectangles are special cases of parallelograms.
A parallelogram does not have to be a rectangle, but since a parallelogram but have 2 sets of parallel sides, it often is. However, rectangles are always parallelograms. I hope this helps, didint exactly understand the question.
Squares, rectangles and rhombuses are all parallelograms. A parallelogram is a shape with opposite sides being parallel and exact in length, and opposite angles are equal. Example, a square, all sides are equal and opposite angles are also equal.