2018_2019学年九年级数学上册第二十四章圆第2课时垂直于弦的直径(作业本)课件(新版)新人教版.ppt

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作业本,第2课时垂直于弦的直径,第二十四章 圆,1.如图,O中弦AB垂直于直径CD于点E,则下列结论: AE=BE; 弧AB=弧BC; 弧AD=弧BD; EO=ED. 其中正确的有( ) A. B. C. D.,作 业 本,B,2.O的弦AB的长为8cm,弦AB的弦心距为3cm,则O的半径为( ) A4cm B5cm C8cm D10cm,作 业 本,B,3如图,CD为O的直径,ABCD于E,DE=8cm,CE=2cm,则AB=_cm,作 业 本,8,4如图,AB为O的弦,AOB=90,AB=a,则OA=_,O点到AB的距离=_,作 业 本,5.如图,O的半径为5,弦AB的长为8,M是弦AB上的动点,则线段OM长的最小值为 ,作 业 本,3,6.如图,AB是O的直径, 弦CDAB于点E,若AB=8, CD=6,求BE的长,作 业 本,7.如图,AB是O的弦,O的半径ODAB 垂足为C若AB=2 ,CD=1,求O的半径长,作 业 本,8.如图所示,O的直径AB和弦CD交于E,已知AE=6cm,EB=2cm,CEA=30,求CD,作 业 本,谢谢!,

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