## Modern geometriesThis comprehensive, best-selling text focuses on the study of many different geometries -- rather than a single geometry -- and is thoroughly modern in its approach. Each chapter is essentially a short course on one aspect of modern geometry, including finite geometries, the geometry of transformations, convexity, advanced Euclidian geometry, inversion, projective geometry, geometric aspects of topology, and non-Euclidean geometries. This edition reflects the recommendations of the COMAP proceedings on Geometry's Future, the NCTM standards, and the Professional Standards for Teaching Mathematics. References to a new companion text, Active Geometry by David A. Thomas encourage students to explore the geometry of motion through the use of computer software. Using Active Geometry at the beginning of various sections allows professors to give students a somewhat more intuitive introduction using current technology before moving on to more abstract concepts and theorems. |

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### Contents

Sets of Axioms and Finite Geometries | 1 |

Geometric Transformations | 34 |

Convexity | 94 |

Copyright | |

10 other sections not shown

### Common terms and phrases

application bisector boundary point center of inversion Chapter circle of inversion circle with center circular region collinear complete quadrangle computer graphics concept congruent conic constant width contains convex body convex hull convex set corresponding points definition determined distance distinct points elliptic geometry endpoint equations equilateral triangle Euclidean geometry exactly example fifth postulate Find the image finite geometry four points given line given point glide reflection harmonic set homogeneous coordinates hyperbolic geometry ideal point interior point invariant inverse points isogonal conjugates length matrix measure midpoint motions nine-point circle non-Euclidean geometry omega triangle perpendicular perspective plane dual point in common point of intersection problem projective geometry proof of Theorem properties radius ratio real numbers Reuleaux triangle rotation Saccheri quadrilateral segment set of axioms set of points shown in Figure shows similar simple closed curve straight line straightedge supporting line symmedian tangent three points three-space translation vector vertex vertices