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It is NOT as case of 'Some'. It is ALL rectangles are parallelograms.
Yes, all rectangles are parallelograms. However, not all parallelograms are rectangles.
True
All parallelograms are not rectangles. The angles of a parallelogram need not be right angles and so the figure need not be a rectangle.
No. Rhombuses that are also rectangles are called squares. Rhombuses are parallelograms with 4 equal sides, while rectangles are parallelograms where all the angles are right.