yes rectangles do have adjacent sides that are perpindicular..... hope that helps....
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"Adjacent" means next to each other. "Perpendicular" means at an angle of 90 degrees. Rectangles (this includes squares) have adjacent perpendicular sides. So do right triangles.
The perpendicular adjacent sides in the triangle would be 3 sides. It is the basically horizonstal line next to a vertical line(perpendicular) if it was parallel adjacent then only two side of triangle /\ <-- parallel
No, a parallelogram does not have perpendicular sides by definition. A parallelogram is a quadrilateral with opposite sides that are parallel and equal in length. Perpendicular sides would form a right angle, which is a characteristic of rectangles, squares, and other types of quadrilaterals, but not parallelograms.
Yes. Squares only contain 90 degree angles, so all sides are perpendicular to the adjacent sides and parallel to the opposite one.
Rectangles have congruent adjacent angles.