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Computational Geometry by David M. Mount
This PDF covers the following topics related to Geometry : Introduction to Computational Geometry, Warm-Up Problem: Computing Slope Statistics, Convex Hulls in the Plane, Convex Hulls: Lower Bounds and Output Sensitivity, Polygon Triangulation, Halfplane Intersection and Point-Line Duality, Linear Programming, Trapezoidal Maps, Trapezoidal Maps and Planar Point Location, Voronoi Diagrams and Fortune’s Algorithm, Delaunay Triangulations: General Properties, Delaunay Triangulations: Incremental Construction, Line Arrangements: Basic Definitions and the Zone Theorem , Hulls, Envelopes, Delaunay Triangulations, and Voronoi Diagrams , Well Separated Pair Decompositions, Geometric Sampling, VC-Dimension, and Applications, Motion Planning, Geometric Basics, Doubly Connected Edge Lists and Subdivision Intersection , etc.
Author(s): David M. Mount, Department of Computer Science, University of Maryland
189 Pages 
Foundations of Geometry by David Hilbert
This PDF book covers the following topics related to Geometry : The Five Groups of Axioms, the Compatibility and Mutual Independence of the Axioms, the Theory of Proportion, the Theory of Plane Areas, Desargues’s Theorem, Pascal’s Theorem, Geometrical Constructions Based Upon the Axioms I-V.
Author(s): David Hilbert, Ph. D. Professor of Mathematics, University of Göttingen
105 Pages
Computational Geometry Lecture Notes
This lecture note explains the following topics: Polygons, Convex Hull, Plane Graphs and the DCEL, Line Sweep, The Configuration Space Framework, Voronoi Diagrams, Trapezoidal Maps, Davenport-Schinzel Sequences and Epsilon Nets.
Author(s): Bernd Gartner and Michael Hoffmann
172 Pages
Geometry for elementary school
This note covers the following topics: Points, Lines, Constructing equilateral triangle, Copying a line segment, Constructing a triangle, The Side-Side-Side congruence theorem, Copying a triangle, Copying an angle, Bisecting an angle, The Side-Angle-Side congruence theorem, Bisecting a segment, Some impossible constructions, Pythagorean theorem, Parallel lines, Squares, A proof of irrationality, Fractals.
Author(s): Wikibooks.org
72 Pages
This text is intended for a brief introductory course in plane geometry. It covers the topics from elementary geometry that are most likely to be required for more advanced mathematics courses. Topics covered includes: Lines Angles and Triangles, m Congruent Triangles, Quadrilaterals, Similar Triangles, Trigonometry of The Right Triangle, Area and Perimeter, Regular Polygons and Circles, Values of The Trigonometric Functions.
Author(s): Henry Africk
NA Pages
This note is a branch of mathematics concerned with questions of shape, size, relative position of figures, and the properties of space.
Author(s): Acellus School
147 Pages
Topics in Geometry Dirac Geometry Lecture Notes
This is an introductory note in generalized geometry, with a special emphasis on Dirac geometry, as developed by Courant, Weinstein, and Severa, as well as generalized complex geometry, as introduced by Hitchin. Dirac geometry is based on the idea of unifying the geometry of a Poisson structure with that of a closed 2-form, whereas generalized complex geometry unifies complex and symplectic geometry.
Author(s): Prof. Marco Gualtieri
NA Pages