is charted plane triangle, rectangle and triangle around rotating rectangular next rotation

Packet : 73462686lesson4.zip filelist
Lesson4/
Lesson4/App.ico
Lesson4/AssemblyInfo.cs
Lesson4/bin/
Lesson4/Form1.cs
Lesson4/Form1.resx
Lesson4/Lesson4.csproj
Lesson4/Lesson4.csproj.user
Lesson4/Lesson4.sln
Lesson4/Lesson4.suo
Lesson4/obj/

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