单选题 适中0.65 引用3 组卷732
如图所示,正方形ABCD的对角线相交于点O,点E是BC上任意一点,EG⊥BD于G,EF⊥AC于F,若AC=10,则EG+EF的值为( )
![](https://img.xkw.com/dksih/QBM/2019/1/14/2118731355529216/2120135184867328/STEM/4c4dd72474f84083addcbc209b0e01ac.png?resizew=69)
![](https://img.xkw.com/dksih/QBM/2019/1/14/2118731355529216/2120135184867328/STEM/4c4dd72474f84083addcbc209b0e01ac.png?resizew=69)
A.10 | B.4 | C.8 | D.5 |
12-13八年级下·全国·课后作业
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如图,矩形ABCD的周长是20cm,以AB,AD为边向外作正方形ABEF和正方形ADGH,若正方形ABEF和ADGH的面积之和为68cm2,那么矩形ABCD的面积是( )
![](https://img.xkw.com/dksih/QBM/2019/2/1/2131190087589888/2131523173351424/STEM/0e9b7f3dc0824175822734562101ab43.png?resizew=121)
![](https://img.xkw.com/dksih/QBM/2019/2/1/2131190087589888/2131523173351424/STEM/0e9b7f3dc0824175822734562101ab43.png?resizew=121)
A.9cm2 | B.16cm2 | C.21cm2 | D.24cm2 |
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