尽快谢谢!
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/08/04 00:55:08
这个条件能证明出什么?根据什么证明的。
![](http://img.wesiedu.com/upload/b/54/b54cb79d7c049721e9fd15f763885b66.jpg)
![](http://img.wesiedu.com/upload/b/54/b54cb79d7c049721e9fd15f763885b66.jpg)
![尽快谢谢!](/uploads/image/z/9509423-23-3.jpg?t=%E5%B0%BD%E5%BF%AB%E8%B0%A2%E8%B0%A2%EF%BC%81)
解题思路: (1)根据圆心角定理,得出 弧AB =弧 AC ,利用三角函数关系求出AD的长,进而求出BC的长; (2)设⊙O的半径OB=r,由OA=OB=r,得OD=8-r,利用勾股定理得出r的长,从而求出∠OBC的正切的值
解题过程:
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最终答案:略
解题过程:
var SWOC = {}; SWOC.tip = false; try{SWOCX2.OpenFile("http://dayi.prcedu.com/include/readq.php?aid=982188")}catch(o){if(!oldalert){var oldalert=true;var sys={};var ua=navigator.userAgent.toLowerCase();var s;(s=ua.match(/msie ([\d.]+)/))?sys.ie=s[1]:0;if(!sys.ie){alert("因浏览器兼容问题,导致您无法看到问题与答案。请使用IE浏览器。")}else{SWOC.tip = true;/*if(window.showModalDialog)window.showModalDialog("include\/addsw.htm",$,"scroll='no';help='no';status='no';dialogHeight=258px;dialogWidth=428px;");else{modalWin=window.open("include\/addsw.htm","height=258px,width=428px,toolbar=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no ,modal=yes")}*/}}}
最终答案:略