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基础训练

D. A. B. D. A. C. O. O. C. B. 基础训练. 1. 如图,菱形 ABCD 中,对角线 AC 、 BD 相交于点 O. 若 AC=8,BD=6, 则菱形的边长 = , 菱形的周长 = ,菱形的面积 = .. 5. 20. 24. 2. 如图,矩形 ABCD 中,对角线 AC 、 BD 相交于点 O. 已知 ∠ AOD=120°,AB=2.5, 则 AC 的长为. 5. 基础训练. 3. 下列说法中正确的是( ) A. 对角线互相垂直的四边形是菱形 B. 对角线相等的四边形是矩形

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基础训练

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  1. D A B D A C O O C B 基础训练 1. 如图,菱形ABCD中,对角线AC、BD相交于点O.若AC=8,BD=6,则菱形的边长=,菱形的周长= ,菱形的面积= . 5 20 24 2. 如图,矩形ABCD中,对角线AC、BD相交于点O.已知 ∠AOD=120°,AB=2.5,则AC的长为. 5

  2. 基础训练 3.下列说法中正确的是( ) A.对角线互相垂直的四边形是菱形 B.对角线相等的四边形是矩形 C.对角线互相垂直的矩形是正方形 D.四条边都相等的四边形是正方形 C

  3. A D E G F B C 基础训练 4.如图,DE是△ABC的中位线,FG是梯形BCED的中位线.如果DE=4,那么FG= . 6 正方 5.依次连接正方形的四边中点所得的四边形是形.

  4. E D F G A B C 例题精讲 例1. 如图,点C在线段AB上,分别以AC、BC为边在线段AB的同侧作正方形ACDE和BCFG,连接AF、BD. (1)AF与BD是否相等?为什么? (2)如果点C在线段AB的延长线上,(1)中所得的结论是否成立?请画出图形,并说明理由.

  5. A Q P B M C 例题精讲 例2. 在△ABC中,P、M、Q分别是AB、BC、CA的中点. (1)试说明四边形APMQ是平行四边形. (2)当△ABC满足什么条件时,四边形APMQ是菱形?

  6. 课堂练习 课本P109 T 11 课本P110 T 17

  7. D A E O G F B C 拓展提高 1.如图,在等腰梯形ABCD中, AD∥BC,对角线AC、BD相交于点O, ∠ADB=60°,E、F、G分别是OA、OB、CD的中点.判断 △EFG的形状,并说明理由.(P111第19题) 2.课本P111 T 20

  8. 课堂小结 通过这节课的学习你有哪些收获?还有什么困惑? 课堂作业 课本P108 10 , 18

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