Trapezoid that has at least one right angle.

### Properties

- Since a line
*d*perpendicular to a line*e*is also perpendicular to all the lines parallel to*e*, then, if a trapezoid has at least one right angle, it always has at least two. - The adjacent angles of an isosceles trapezoid that are not right angles are supplementary angles.

### Example

This is a right trapezoid with right angles *A* and *D* :