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(2012•利辛县二模)若等腰梯形的上、下底边分别为1和3,一条对角线长为4,则...
(2012•利辛县二模)若等腰梯形的上、下底边分别为1和3,一条对角线长为4,则这个梯形的面积是( )
A.16
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021225759361753041/SYS201310212257593617530009_ST/0.png)
B.8
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021225759361753041/SYS201310212257593617530009_ST/1.png)
C.4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021225759361753041/SYS201310212257593617530009_ST/2.png)
D.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021225759361753041/SYS201310212257593617530009_ST/3.png)
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