大学选修课论文有这个的参考下吧

Original proposition find

Proposition 5: if two triangle, a two horns were equal to another two horn, and side is equal

to the other side, which have a side yes DengJiao home change, or is the DengJiao edge, then their other edge also equal to the other side, and the other to the horn of the horns of the other Proof: if AB indicates DE

Might as well put AB > DE take BG is equal to DE Connection GC ∵ BG = DE BC = EF GB = DE BC = EF

∴ < GBC = < DEF GC = DF

And ∵ enables delta GBC ≌ enables delta DEF ∴ the rest Angle and edge also equal (proposition 1) ∴ < GCB = < DFE ∴ < BCG = < BCA