以线段a=7,b=8,c=9,d=11为边作四边形,可作( )A.一个 | B.2个 | C.3个 | D.无数个 |
答案
举一反三
边长为2的正六边形的面积是( )A.6![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026062002-52401.png) | B.3![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026062002-60155.png) | C.12![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026062003-79808.png)
| D.![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026062003-56840.png) | 平行四边形、矩形、菱形、正方形的关系是( )A.
![魔方格](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026061954-58737.png)
| B.
![魔方格](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026061954-11240.png)
| C.
![魔方格](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026061954-23126.png)
| D.以上都不对 | 若一个多边形截去一个角后,变成十五边形,则原来的多边形的边数可能为( )A.14或15或16 | B.15或16 | C.14或16 | D.15或16或17 | 已知四边形ABCD中,AC⊥BD,AC=4,BD=5,那么这个四边形的面积等于______. |
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