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Are rectangles parallelogram because their sides are parallel?
Yes all rectangles are parallelogram but all parallelogram cannot be rectangles.
There are some parallelograms which are not rectangles true or false?
yes. rectangles are just the special cases of parallelograms where the angles are all 900
Are all rectangles are parallelograms but not all parallelograms are rectanges true or false?
That is true. A parallelogram is a quadrilateral with both pairs of opposite sides parallel to one another. Special types of parallelograms include a rhombus (all four sides also congruent to each other), a rectangle (all four interior angles measure 90o), and a square (all four sides congruent and all four interior angles are right). A rectangle is a special case of a parallelogram, therefore all rectangles are by definition parallelograms but not all parallelograms are rectangles.
What parallelogram has no right angles?
All of them, except rectangles. (Rectangles are special parallelograms.)
Can a parallelogram also be a rectangle?
Some parallelograms are rectangles; all rectangles are parallelograms.
