For AB to be perpendicular to CD, the angles, AED, BED, AEC and BEC must be 90 degrees. We would measure these angles by using a protractor. The results are shown below
angle AED = 80 degrees
angle BED = 100 degrees
angle AEC = 100 degrees
angle BEC = 80 degrees
Since the angles are not 90 degrees,
AB is not perpendicular to CD
The statement is not true