[ª] , [©] , [^] , [¨]Theorem of incribed angles / Understanding with measurement(GC World : Various Problems ,Famous Theorems)
Let's move point P.
What relationship is there between ÚAPB and ÚAOB when the position of P is upside?
What relationship is there between ÚAPB and ÚAOB when the position of P is downside?

GC/Win


Forum of Geometric Constructor by Y.Iijima