In a parallelogram consecutive angles are always supplementary. This means they equal 180.
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Then it's consecutive angles are supplementary.
Yes.
a rectangle has four right angles and opposite sides are all the same length This means that a parallelogram is not always a rectangle, but a rectangle is always a parallelogram, by definition.
An equilateral quadrilateral which would include a square.
Except for rectangles, no parallelogram has right angles.