Proof: We know that angle CBA is congruent to angle FBA and that angle CAB is congruent to angle FAB because the corresponding angles have the same measure in degrees (as evidenced in the given equation). We see that angle BCA is congruent to angle BFA by the reflexive property of congruence (More accurately Third Angle Theorem). Therefore, we can conclude that triangle BCA is congruent to triangle BFA because a pair of corresponding angles and the included side are equal, since the two triangles share a line segment (AB).
