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Are the opposite sides of a parellelogram parallel?
Yes. A parallelogram is defined as having opposite sides that are parallel and equal in length, and opposite angles that are equal.
Quadrilateral with congruent sides and no right angles?
rhombus. The rhombus is a quadrilateral with all sides equal in length. It is also a parallelogram, so opposite sides are parallel and equal in length, and opposite angles are equal.
A shape with 4 equal-lenth sides opposite sides parallel but no right angles?
A rhombus has 4 sides of equal length, opposing parallel sides, and no right angles
What shape is a square but not a parelellogram?
No shape is a square but not a parallelogram as all squares are parallelograms: All parallelograms have opposite sides parallel and of equal length, and opposite angles are equal. All squares have opposite sides that are parallel and of equal length, and opposite angles are equal; thus all squares are parallelograms. However, all squares also have all angles equal to 90o and all four sides equal, but some parallelograms have angles not all 90o and/or not all four sides of equal length; thus not all parallelograms are squares.
What quadrilateral shape has 4 right angles opposite sides equal in length and parallel?
A rectangle.
