All of them are.
It is NOT as case of 'Some'. It is ALL rectangles are parallelograms.
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.
false
True
Some of them (rectangles) do.
yes, it is true
Yes.
Yes
yes
yes. rectangles are just the special cases of parallelograms where the angles are all 900