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3, 4cm5cm7cm,(sss),: .,(SSS),:(),ABCDEF, ABCDEF SSS,1ABCDADBC ABCD.:ABCCDA,1:AB = DC , AD = BC : A = C,BDABDCDBA = C, S.A.S, (A.S.A), (A.A.S), (S.S.S),:, 1 1 ADBCOAODO BOCO. ABOBCO 2 ACAD BCBD. ABCABD 3 AC BD. ABOCDO 4 ADBCEAEBE CEDE ACBD. ABCBAD,1:.AB = DC , AC = DB : A = D,BCSSS,2:.AB = AD ,BC = DC :B= D,AC,ABCADC, ABCADC SSS,B=D,3:.B E C F , AB = DE , AC = DF,BE = CF : A = D,BE+CECF+CEBCEFSSSSABCSDEFA = D,4:.AB = DC , AC = DBOA = OD :A = D,5ABCAB=AC ADABCD. ADBC,:ABDACD, ABD ACD (SSS),ADBC,1 = BDC=900,1 = 2,
