Adjacent sides are perpendicular. Opposite sides are parallel.
It fits the description of a right angle triangle
It could be a right angle triangle
shape no pairs of perpendicular sides
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
In a square adjacent sides are perpendicular to each other and opposite sides are parallel to each other.
Yes. Adjacent sides in a cube are perpendicular and planes that are perpendicular to the same plane are parallel.