Which two angles of a figure-eight triangle are equal?

Analysis: This question is an open question, which is actually to examine the students' mastery of the triangle congruence judgment method. Here, we can use the exclusion method to analyze. If two angles of two triangles are equal, then the third angle is equal and the relationship between the two triangles is identical or similar. So exclude a, b, c; D if the bisectors of a pair of equal corners are equal and two triangles are congruent, it can be proved that the triangles are congruent. So D. Comments: This topic examines the judgment methods of triangle congruence. The general methods for judging two triangles are: SSS, SAS, ASA, AAS and HL. Note: AAA and SSA can't judge the congruence of two triangles, so when judging the congruence of two triangles, it must be.