Which statement is false? a. the all them of a regular polygon is perpendicular to the side. b. the radius of a regular polygon is always greater than the all them. c. the perimeter of a regular hexagon is 6r. d. the perimeter of a regular n-gob is the area divided by the all them.

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?