12 2 SSS ABC DEF ABC DEF SSS 1 SSS 2 1 3 4 SSS A ABAC ABC A B C AB A B AC A C A A A B C ABC 1 DA E A 2 ADA B AB A EA C AC 3 B C A C B A E D C B 2 ABC DEF ABC DEF SAS SAS F E D C B A 1 AC 10cm BC 8cm A 45 ABC SSA ABC AB C A B D A B C SSA SAS SSS SAS AC BD CAB DBA BC AD ABC BAD AC BD CAB DBAAB BA ABC BAD SAS BC AD C 1 AOB DOC AO DO BO CO AOB DOC AOB DOC SAS 2 AEC ADB AE AD AC AB AEC ADB A A AEC ADB AE AD AC AB SAS AEC ADB 1 AB AC ABD ACD ABD ACD AB AC BAD CAD S A S AD AD BD CD S 2 ACB ADB A B C D ACB ADB S A S ACB ADB AB AB CAB DAB AC AD S BC BD 3 AD BC AE CF AD BC E AB DE AC DF ABC DEF SSS ABC DEF ABC DEF SSS 1 2 ABC DEF ABC DEF SAS SAS F E D C B A A B D A B C SSA