摘要:(2)当BC=4,cosC=时.求⊙O的半径.
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如图△ABC中,AB=AC,AE⊥BC,E为垂足,F为AB上一点.以BF为直径的圆与AE相切于M点,交BC于G点.
(1)求证:BM平分∠ABC;
(2)当BC=4,cosC=
时,
①求⊙O的半径;
②求图中阴影部分的面积.(结果保留π与根号)
![](http://thumb.1010pic.com/pic2/upload/papers//20140823/201408230333349314486.jpg)
(1)求证:BM平分∠ABC;
(2)当BC=4,cosC=
![](http://thumb.1010pic.com/pic2/upload/papers//20140823/20140823033334915338.png)
①求⊙O的半径;
②求图中阴影部分的面积.(结果保留π与根号)
![](http://thumb.1010pic.com/pic2/upload/papers//20140823/201408230333349314486.jpg)
已知:如图,在△ABC中,AB=AC,AE是角平分线,BM平分∠ABC交AE于点M,经过B,M两点的⊙O交BC于点G,交AB于点F,FB恰为⊙O的直径.
(1)求证:AE与⊙O相切;
(2)当BC=4,cosC=时,求⊙O的半径.
已知:如图,在△ABC中,AB=AC,AE是角平分线,BM平分∠ABC交AE于点M,经过B,M两点的⊙O交BC于点G,交AB于点F,FB恰为⊙O的直径.
(1)求证:AE与⊙O相切;
(2)当BC=4,cosC=时,求⊙O的半径.
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