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TRABC
LTABAC
NCABC   defn:triangle
EQAB   assumption
 COABC  defn:collinear
NEAB   reductio
NEBA   lemma:inequalitysymmetric
EQAC   assumption
 COABC defn:collinear
NEAC   reductio
NECA   lemma:inequalitysymmetric
EEACAC  cn:congruencereflexive
ANBEADC+EEADAB  proposition:03
BEADC
COBCD     assumption
 CODCB    lemma:collinearorder
 COADC    defn:collinear
 CODCA    lemma:collinearorder
 NEDC    lemma:betweennotequal
 COCBA   lemma:collinear4
 COABC   lemma:collinearorder
NCBCD     reductio
TRBCD     defn:triangle
BECDA     axiom:betweennesssymmetry
AODCBBDA  proposition:16
EQBC  assumption
 COBCD  defn:collinear
NEBC  reductio
NECB  lemma:inequalitysymmetric
COADB   assumption
 COADC   defn:collinear
 CODAC   lemma:collinearorder
 CODAB   lemma:collinearorder
 NEAD    lemma:betweennotequal
 NEDA    lemma:inequalitysymmetric
 COACB   lemma:collinear4
 COABC   lemma:collinearorder
NCADB    reductio
TRADB    defn:triangle
EEADAB
ISADB     defn:isosceles
EAADBABD  proposition:05
RACAD    lemma:ray4
EQBB     cn:equalityreflexive
RACBB    lemma:ray4
COACB    assumption
 COABC   lemma:collinearorder
NCACB    reductio
EAACBACB  lemma:equalanglesreflexive
EAACBDCB  lemma:equalangleshelper
AOACBBDA  lemma:angleorderrespectscongruence2
EAADBBDA  lemma:ABCequalsCBA
AOACBADB  lemma:angleorderrespectscongruence
EAADBABD
EAABDADB  lemma:equalanglessymmetric
AOACBABD  lemma:angleorderrespectscongruence
COBCA    assumption
 COABC   lemma:collinearorder
NCBCA     reductio
EABCAACB  lemma:ABCequalsCBA
AOBCAABD  lemma:angleorderrespectscongruence2
EQCC      cn:equalityreflexive
EQAA      cn:equalityreflexive
RABCC     lemma:ray4
RABAA     lemma:ray4
BEADC
COABD  assumption
 COADB  lemma:collinearorder
NCABD  reductio
EAABDABD   lemma:equalanglesreflexive
AOABDABC  defn:anglelessthan
AOBCAABC  lemma:angleordertransitive