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如图,圆弧型声波DFE从坐标原点O向外传播.若D是DFE弧与x轴的交点,设OD=...
如图,圆弧型声波DFE从坐标原点O向外传播.若D是DFE弧与x轴的交点,设OD=x(0≤x≤a),圆弧型声波DFE在传播过程中扫过平行四边形OABC的面积为y(图中阴影部分),则函数y=f(x)的图象大致是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101051457280464/SYS201311031010514572804003_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101051457280464/SYS201311031010514572804003_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101051457280464/SYS201311031010514572804003_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101051457280464/SYS201311031010514572804003_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101051457280464/SYS201311031010514572804003_ST/images4.png)
考点分析:
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D.
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椭圆C:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101051457117035/SYS201311031010514571170020_ST/0.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101051457117035/SYS201311031010514571170020_ST/1.png)
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如图,△OAB是边长为2的正三角形,记△OAB位于直线x=t(t>0)左侧的图形的面积为f(t).
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(注:画图时标明关键点的坐标.)
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