Yes.
A parallelogram is any 4-sided figure where the opposite sides are parallel. Only the special case where all four angles are 90° do you have a rectangle.
To visualize, picture a cardboard box, closed on top, and open on two sides. Move the top so that it is leaning a little, and both open sides are parallelograms.
(see related question)
In fact, some are rectangles, but not all are.
True
Yes, all rectangles are parallelograms. However, not all parallelograms are rectangles.
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.
In fact, some are rectangles, but not all are.
All rectangles are parallelograms, so yes there are some.
No. Only some parallelograms are rectangles. But all rectangles are parallelograms.
Some parallelograms are rectangles; all rectangles are parallelograms.
All of them are.
false
True
Yes.
Some of them (rectangles) do.
yes, it is true
Yes
yes