On a maps coordinate grid, walt city is located at (-1,-3) and koshville is located at (4,9). how long is a trains route as the train travels along a straight line from walt city to koshville

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?