广东省2019年中考数学总复习第一部分知识梳理第五章特殊四边形第22讲矩形与菱形课件.ppt

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第22讲 矩形与菱形,1. (10分) (2017衡阳) 菱形的两条对角线分别是12和16,则此菱形的边长是( ) A. 10 B. 8 C. 6 D. 52.(10分)下列性质中,菱形不一定具有的性质是( ) A对角线互相平分 B对角线互相垂直 C对角线相等 D既是轴对称图形又是中心对称图形,A,C,3. (10分) 如图K1-22-1,在矩形ABCD中(ADAB),点E是BC上一点,且DE=DA,AFDE,垂足为点F,则下列结论不一定正确的是( ) A. AFDDCE B. AF= AD C. AB=AF D. BE=AD-DF4.(10分)(2018淮安)如图K1-22-2,菱形ABCD的对角线AC,BD的长分别为6和8,则这个菱形的周长是( )A20 B24 C40 D48,B,A,5. (10分)如图K1-22-3,在矩形ABCD中,对角线AC,BD交于点O,下列说法错误的是( ) A. ABC=90 B. AC=BD C. OA=OB D. OA=AD6. (20分) 如图K1-22-4,矩形ABCD的对角线AC,BD相交于点O,CEBD,DEAC. 若AC=4,则四边形CODE的 周长是_.,D,8,

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