Is every parallelogram 90 degrees

No, not every parallelogram has angles of 90 degrees. A parallelogram is defined as a quadrilateral with opposite sides that are parallel, and while it can have right angles (making it a rectangle), it can also have angles that are acute or obtuse. The only requirement is that opposite angles are equal and adjacent angles are supplementary. Thus, while rectangles and squares are special types of parallelograms with right angles, most parallelograms do not have all angles at 90 degrees.