Transversal of Parallel Lines
Click and drag point A to change the angle of the parallel lines.
Click and drag point M to change the distance between the parallel lines.
Click and drag point D to change the angle of the transversal.
Click and drag any point along its line and click and drag any label.
Check the boxes to show the location and measure of any angle.
Click the blue refresh icon in the top right corner to reset the applet.