Mathematics Teacher (1967) Vol. 60, No. 1

  • Mathematics Teacher (1967) Vol. 60, No. 1

    NATIONAL COUNCIL OF TEACHERS OF MATHEMATICS JANUARY 1967 VOLUME J,X, NUMBER 1 Euclidean and Other Geometries Bruce E. Meserve Straight-Line Tunnels Through the Earth William C. Stretton The Return of the Old Mathematics Brother L . Raphael, F. S.C. How Shall We Define Angle? Harry Sitomer and Howard F. Fehr • A Journal