No, a cylinder does not have any right angles because it has two circles and a tube comprising it so as they do not have any right angles, the cylinder will not either.
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A rectangle, possibly a square. Can you see why a parallelogram must be a rectangle if any one of its angles is right?
yes 4 right angles
Except for rectangles, no parallelogram has right angles.
No, all angles are right angles
Yes.