Question
谞转讜谉 讟专驻讝 砖讜讜讛 砖讜拽讬讬诐, 砖讗讜专讱 讛砖讜拽 砖诇讜 a, 讜讗讜专讱 讛讗诇讻住讜谉 砖诇讜 b, 讻诪讜 讘爪讬讜专. 诪爪讗 讗转 讛注专讱 讛讙讚讜诇 讘讬讜转专 讜讛拽讟谉 讘讬讜转专 砖讬讻讜诇讛 诇拽讘诇 诪讻驻诇转 讛讘住讬住讬诐 (讛转砖讜讘讛 转诇讜讬讛 讘-`a` 讜讘-`b`).

Topics:
Geometry
->
Area Calculation
Geometry
->
Plane Geometry
->
Circles
Algebra
Geometry
->
Plane Geometry
->
Pythagorean Theorem
- Israeli IMO Selection, 2011, Stage A Question 9
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