摘要:A.∠A+∠ADC=180°―→AB∥CD B.∠1=∠2―→AD∥BCC.AB∥CD―→∠ABC+∠C=180° D.AD∥BC―→∠3=∠4
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(2008•新疆)如图,下列推理不正确的是( )
A.∵AB∥CD,∴∠ABC+∠C=180°
B.∵∠1=∠2,∴AD∥BC
C.∵AD∥BC,∴∠3=∠4
D.∵∠A+∠ADC=180°,∴AB∥CD
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A.∵AB∥CD,∴∠ABC+∠C=180°
B.∵∠1=∠2,∴AD∥BC
C.∵AD∥BC,∴∠3=∠4
D.∵∠A+∠ADC=180°,∴AB∥CD
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