{ | AB=AD BC=DC AC=AC |
{ | AB=AD ∠BAO=∠DAO AO=AO |
{ | BC=DC ∠BCO=∠DCO CO=CO |
{ | ∠E=∠F=90° ∠B=∠C AE=AF |
{ | ∠1=∠2 ∠B=∠C AD=AD |
{ | ∠BAC=∠CAB AB=AC ∠B=∠C |
{ | AE=AF ∠1=∠2 AD=AD |
{ | AB=DE(已证) ∠A=∠D(已证) AC=DF(已知) |
{ | AB=DE ∠B=∠DEF BC=EF |
{ | ∠ABD=∠CAE ∠BDA=∠AEC AB=AC |
{ | ∠ECF=∠B EC=BC ∠ACB=∠FEC=90° |
{ | ∠AFB=∠DEA=90° ∠FBA=∠EAD AB=DA |
{ | ∠ADC=∠CEB=90° ∠BCE=∠CAD AC=BC |
{ | ∠ECF=∠B EC=BC ∠ACB=∠FEC=90° |