Tony who is 6 ft tall is looking at a mirror on the ground 12 feet in front of him and he can see the top of the flagpole. He knows the distance from the mirror to the flagpole is 18 ft and that the 2 triangles are similar. Determine the height of the flagpole.

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?