Not unless the parallelogram is a rectangle. In every parallelogram, consecutive angles are supplementary.
All rectangles, including squares.
always
It is a rectangle.
Squares and rhombuses can be congruent, but not always. If the rhombus is also a square, it is congruent to a square with the same dimensions. However, since a rhombus only demands for OPPOSITE angles to be congruent, and a square means ALL angles are 90 degrees, this is not always the case.
rectangle and square
There are instances that quadrilateral angles can be consecutive and opposite angles are congruent. The best examples are square and rectangle.
Square and Rectangle
Rectangles, of which squares are a special case.
Square and Rectangle
2
Square and Rectangle Apex
All rectangles (this includes squares).
If you want to know if they're congruent, its usually a square and a rectangle
Rectangles (including squares).
Only in squares and rectangles. In a rhombus, the consecutive angle is supplementary (sums to 180 degrees).
rhombus