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TRABC
NCABC  defn:triangle
EQBA assumption
 COBAC defn:collinear
 COABC lemma:collinearorder
NEBA  reductio 
EQBC  assumption
 COABC defn:collinear
NEBC reductio
NECB lemma:inequalitysymmetric
EQCA assumption
 COBCA defn:collinear
 COABC lemma:collinearorder
 NCABC
NECA  reductio
ANBEBAD+EEADCA  lemma:extension
BEBAD
NEAD  lemma:betweennotequal
NEDA lemma:inequalitysymmetric
NEBD  lemma:betweennotequal
NEDB  lemma:inequalitysymmetric
EEADCA
EEADAC   lemma:congruenceflip
COADC    assumption
 COBAD   defn:collinear
 CODAB   lemma:collinearorder
 CODAC   lemma:collinearorder
 NEAD    lemma:betweennotequal
 NEDA    lemma:inequalitysymmetric
 COABC   lemma:collinear4
NCADC    reductio
EQDC assumption
 COADC  defn:collinear
NEDC reductio
TRADC    defn:triangle
ISADC    defn:isosceles
EAADCACD   proposition:05
COACD    assumption
 COADC  lemma:collinearorder
NCACD    reductio
EAACDDCA  lemma:ABCequalsCBA
EAADCDCA  lemma:equalanglestransitive
EQDD     cn:equalityreflexive
EQBB     cn:equalityreflexive
EQCC     cn:equalityreflexive
EQCD  assumption
 COACD  defn:collinear
NECD  reductio
RACDD    lemma:ray4
RACBB lemma:ray4
BEDAB    axiom:betweennesssymmetry
AOADCDCB   defn:anglelessthan
RADAB    lemma:ray4
RADCC    lemma:ray4
RADBB    lemma:ray4
EEDBDB    cn:congruencereflexive
EEDCDC    cn:congruencereflexive
EEBCBC    cn:congruencereflexive
NCADC
EAADCBDC  defn:equalangles
EABDCADC  lemma:equalanglessymmetric
AOBDCDCB   lemma:angleorderrespectscongruence2
COBCD   assumption
 COBAD   defn:collinear
 CODBA   lemma:collinearorder
 CODBC   lemma:collinearorder
 NEBD    lemma:betweennotequal
 NEDB    lemma:inequalitysymmetric
 COBAC   lemma:collinear4
 COABC   lemma:collinearorder
NCBCD    reductio
COCDB    assumption
 COBCD   lemma:collinearorder
NCCDB    reductio
EACDBBDC  lemma:ABCequalsCBA
EABCDDCB  lemma:ABCequalsCBA
AOCDBDCB   lemma:angleorderrespectscongruence2
AOCDBBCD   lemma:angleorderrespectscongruence
TRBCD    defn:triangle
AOCDBBCD
LTBCBD   proposition:19
BEBAD 
LTBCBD
EEADAC
TGBAACBC  defn:togethergreater