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AD⊥BC ∠B.=∠ C. AB=2BD AD平分∠BAC
△DAB≌△DAC △DEA≌△DFA CD=DE ∠AED=∠AFD
△DAB≌△DAC △DEA≌△DFA CD=DE ∠AED=∠AFD
∠ =∠CB.AD⊥BC AD平分∠BAC AB=2BD
△DAB≌△DAC △DEA≌△DFA CD=DE ∠AED=∠AFD
△ABD.≌△ACD ∠ADB=90° ∠BAD是∠B的一半 AD平分∠BAC
∠A.与∠D.互为余角 ∠A.=∠2 △ABC≌△CED ∠1=∠2
∠A.与∠D.互为余角 ∠A.=∠2 △ABC≌△CED ∠1=∠2
BC=AD CO=OD ∠C=∠D ∠AOB=∠C+∠D
AD=AE DB=EC ∠ADE=∠C DE=BC ,
△DAB≌△DAC △DEA≌△DFA CD=DE ∠AED=∠AFD
BD=DC CE=AE ∠BAD=∠CAD ∠CBE=∠DAC
当AB = BC 时,它是菱形 当AC⊥BD 时,它是菱形 当∠ABC = 90º 时,它是矩形 当AC = BD 时,它是正方形
△DAB≌△DAC △DEA≌△DFA CD=DE ∠AED=∠AFD
∠ =∠ B.AD⊥BC C.AD平分∠BAC AB=2BD
a+3>b+3 a-3>b-3 3a>3b -3a>-3b
∠A与∠D互为余角 ∠A=∠2 △ABC≌△CED ∠1=∠2
肯定前件会导致正确的结论 肯定后件会导致不正确的结论 否定前件会导致不正确的结论 否定后件会导致不正确的结论