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若一直角三角形的斜边长为c,内切圆半径是r,则内切圆的面积与三角形面积之比是( ...
若一直角三角形的斜边长为c,内切圆半径是r,则内切圆的面积与三角形面积之比是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185906707364563/SYS201311011859067073645008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185906707364563/SYS201311011859067073645008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185906707364563/SYS201311011859067073645008_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185906707364563/SYS201311011859067073645008_ST/3.png)
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