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“赵爽弦图”是由四个全等的直角三角形与中间的一个小正方形拼成的一个大正方形(如图...
“赵爽弦图”是由四个全等的直角三角形与中间的一个小正方形拼成的一个大正方形(如图所示).小亮同学随机地在大正方形及其内部区域投针,若直角三角形的两条直角边的长分别是2和1,则针扎到小正方形(阴影)区域的概率是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160656222131680/SYS201310221606562221316005_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160656222131680/SYS201310221606562221316005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160656222131680/SYS201310221606562221316005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160656222131680/SYS201310221606562221316005_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160656222131680/SYS201310221606562221316005_ST/3.png)
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