Search
Google ClassroomGoogle Classroom
GeoGebraGeoGebra Classroom

Outline

  1. Introduction to Deductive Geometry
    1. Theorems related to Parallel Lines
    2. Interior and Exterior Angles of Triangles

    Introduction to Deductive Geometry

    Author:Anthony OR 柯志明
    Topic:Geometry
    Introduction to Deductive Geometry

    Table of Contents

    • Theorems related to Parallel Lines

      • Angles related to parallel lines
      • Angles related to parallel lines (Converses)
      • Example 9.2
      • Example 9.3
    • Interior and Exterior Angles of Triangles

      • Angle Sum of Triangle
      • Exterior Angle of Triangle
      • Example 9.4
    Next
    Angles related to parallel lines

    New Resources

    • Untitled
    • GGB is Awesome!
    • Prism Drawn in 2-Point Perspective
    • גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
    • Making New Year's resolutions for 2026

    Discover Resources

    • VETTORI
    • Braley, Averi
    • FR 4 Box Plots
    • Properties of Rhombi
    • Area of Rectangles
    • ชุดที่4

    Discover Topics

    • Standard Deviation
    • Derivative
    • Set Theory
    • Exponent
    • Natural Numbers
    AboutPartnersHelp Center
    Terms of ServicePrivacyLicense
    Graphing CalculatorCalculator SuiteMath Resources

    Download our apps here:

    Download_on_the_App_Store_Badge_US-UK_RGB_blk_4SVG_092917

    © 2026 GeoGebra®