Answer:

mÐA = 50°, mÐ B = 92°, mÐC  = 88°

Large triangle = 38° + 63° + (29° + A)

38 + 63 + (29 + A) = 180                   50 + 38 + B = 180                 92 + C = 180

               130 + A = 180                          88 + B = 180       92 - 92 + C = 180 - 92

      130 - 130 + A = 180 – 130      88 - 88 + B = 180 - 88                       C = 88°

                     A = 50°                                 B = 92°