Not unless the parallelogram is a rectangle.
In every parallelogram, consecutive angles are supplementary.
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quadrilaterals are consecutive and opposite angles always congruent?
Congruent
Parallelograms: 1.)opposite side of a parallelogram are parallel and you can prove that by finding the slope for both lines. 2.) opposite sides of a parallelogram are congruent 3.) diagonals bisect each other 4.)opposite angles are congruent 5.) consecutive angles are supp.
All rectangles, including squares.
supplementary