Angle CAB is congruent to angle C'A'B'. This is given.
Angle CBA is 56 degrees. This is from the sum of interior angles of a triangle (180 - 41 - 83 = 56)
Angle CBA is congruent angle C'B'A'. Angle CBA is 56 degrees.
Triangle CAB is similar to triangle C'B'A. By the AAA similarity postulate.