7.5 Identifying a Trapezoid in the Coordinate Plane

Points A and B are movable in the Applet below.
Show that ORST is a trapezoid. Then decide whether it is isosceles.
Step 1: Compare the slopes of opposite sides by moving points A and B to create parallel lines.
Is ORST a trapezoid?
Step 2: Compare the lengths of legs and by using the "Distance" button under the "Tools" option in the Applet.
Is ORST isosceles?