Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. right triangle abc is represented with right angle at vertex b. points d and e lies on sides ab and bc. segment de is drawn. in δabc, and m∠abc = 90°. d and e are the midpoints of and , respectively. if the length of is 9 units, the length of is units and m∠cab is °.