C#已知三点求圆方程算法

已知三点的XY坐标值，求出圆方程圆心的坐标值和圆的半径。使用VS2010版本编写。博文地址：

 属性            大小     日期    时间   名称
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     文件      12288  2019-01-08 10:09  三点画圆\DrawCircle\DrawCircle\bin\Debug\DrawCircle.exe

     文件      26112  2019-01-08 10:09  三点画圆\DrawCircle\DrawCircle\bin\Debug\DrawCircle.pdb

     文件      11600  2019-01-08 10:09  三点画圆\DrawCircle\DrawCircle\bin\Debug\DrawCircle.vshost.exe

     文件        490  2017-09-29 21:43  三点画圆\DrawCircle\DrawCircle\bin\Debug\DrawCircle.vshost.exe.manifest

     文件       3679  2019-01-07 21:31  三点画圆\DrawCircle\DrawCircle\DrawCircle.csproj

     文件       2963  2019-01-08 10:09  三点画圆\DrawCircle\DrawCircle\Form1.cs

     文件       9943  2019-01-08 10:05  三点画圆\DrawCircle\DrawCircle\Form1.Designer.cs

     文件       5817  2019-01-08 10:05  三点画圆\DrawCircle\DrawCircle\Form1.resx

     文件       2867  2019-01-08 09:15  三点画圆\DrawCircle\DrawCircle\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache

     文件       6398  2019-01-08 10:09  三点画圆\DrawCircle\DrawCircle\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache

     文件       1465  2019-01-08 10:09  三点画圆\DrawCircle\DrawCircle\obj\x86\Debug\DrawCircle.csproj.FileListAbsolute.txt

     文件        975  2019-01-08 10:05  三点画圆\DrawCircle\DrawCircle\obj\x86\Debug\DrawCircle.csproj.GenerateResource.Cache

     文件      12288  2019-01-08 10:09  三点画圆\DrawCircle\DrawCircle\obj\x86\Debug\DrawCircle.exe

     文件        180  2019-01-08 10:05  三点画圆\DrawCircle\DrawCircle\obj\x86\Debug\DrawCircle.Form1.resources

     文件      26112  2019-01-08 10:09  三点画圆\DrawCircle\DrawCircle\obj\x86\Debug\DrawCircle.pdb

     文件        180  2019-01-08 09:56  三点画圆\DrawCircle\DrawCircle\obj\x86\Debug\DrawCircle.Properties.Resources.resources

     文件        491  2019-01-07 20:57  三点画圆\DrawCircle\DrawCircle\Program.cs

     文件       1370  2019-01-07 20:57  三点画圆\DrawCircle\DrawCircle\Properties\AssemblyInfo.cs

     文件       2872  2019-01-07 20:57  三点画圆\DrawCircle\DrawCircle\Properties\Resources.Designer.cs

     文件       5612  2019-01-07 20:57  三点画圆\DrawCircle\DrawCircle\Properties\Resources.resx

     文件       1097  2019-01-07 20:57  三点画圆\DrawCircle\DrawCircle\Properties\Settings.Designer.cs

     文件        249  2019-01-07 20:57  三点画圆\DrawCircle\DrawCircle\Properties\Settings.settings

     文件        872  2019-01-07 20:57  三点画圆\DrawCircle\DrawCircle.sln

    ..A..H.     18944  2019-01-08 10:09  三点画圆\DrawCircle\DrawCircle.suo

     目录          0  2019-01-08 07:54  三点画圆\DrawCircle\DrawCircle\obj\x86\Debug\TempPE

     目录          0  2019-01-08 10:09  三点画圆\DrawCircle\DrawCircle\obj\x86\Debug

     目录          0  2019-01-08 09:56  三点画圆\DrawCircle\DrawCircle\bin\Debug

     目录          0  2019-01-08 07:54  三点画圆\DrawCircle\DrawCircle\obj\x86

     目录          0  2019-01-08 07:54  三点画圆\DrawCircle\DrawCircle\bin

     目录          0  2019-01-08 07:54  三点画圆\DrawCircle\DrawCircle\obj

............此处省略7个文件信息