[ª] , [©] , [^] , [¨]Length of segment turned by straight line / Confirming with additional line(GC World : Various Problems ,MaxEMin)
A is on a half-line OX.
B is on a half-line OY.
Let's move A and B.
When will the perimeter of ĢPAB be minimized?

GC/Win


Forum of Geometric Constructor by Y.Iijima