Maggie colors a figure in the shape of a trapezoid. the trapezoid is 6 inches tall. the bases are 4.5 inches and 8 inches, what is the area of the figure that maggie colored

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?