两圆有多种位置关系,图中不存在的位置关系是
.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000918209451260/SYS201311030009182094512015_ST/images0.png)
考点分析:
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如图,菱形ABCD的对角线的长分别为6和8,点P是对角线AC上的任意一点(点P不与点A,C重合),且PE∥BC交AB于点E,PF∥CD交AD于点F,则阴影部分的面积是
.
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如图,⊙O内切于△ABC,切点分别为D,E,F、已知∠B=50°,∠C=60°,连接OE,OF,DE,DF,那么∠EDF等于
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若最简二次根式
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是同类二次根式,则a
b=
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如图,在△ABC中,已知∠C=90°,BC=6,AC=8,则它的内切圆半径是( )
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A.
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B.
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C.2
D.1
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Rt△ABC中,∠C=90°,AC=8,BC=6,两等圆⊙A,⊙B外切,那么图中两个扇形(即阴影部分)的面积之和为( )
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A.
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π
B.
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π
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