Look at the figure below:
Triangle ABC is a right triangle with angle ABC equal to 90 degrees. The length of AC is 5 units, and the length of AB is 4 units. D is a point above C. Triangle ADC is a right triangle with angle DAC equal to 90 degrees and DC parallel to AB.
What is the length, in units, of segment CD?
8
9
6.25
7.25
