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如图1,四边形ABCD中,AD∥BC,AB⊥BC,点E在边AB上,∠DEC=90°,且DE=EC.(1)求证:△ADE≌△BEC;(2)若AD=a,AE=b,DE=c,请用图1证明勾股定理:a2+b...
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教案备课库《2016年安徽省阜阳市颍泉区中考数学一模试卷》真题及答案
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如图在四边形ABCD中对角线AC与BD相交于点O不能判断四边形ABCD是平行四边形的是
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AD=BC,AB∥CD
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AB∥DC,AD∥BC
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探究如图①在四边形ABCD中∠BAD=∠BCD=90°AB=ADAE⊥CD于点E.若AE=10求四边
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AB∥DC,AD∥BC
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