olymmath

Putnam 1942 B1

  • Session B

A square of side 2a2a , lying always in the first quadrant of the xyxy -plane, moves so that two consecutive vertices are always on the xx - and yy -axes respectively. Prove that a point within or on the boundary of the square will in general describe a portion of a conic. For what points of the square does this locus degenerate?

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