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

    • Building Parallelograms with Set Areas
    • Publish app "Public" test
    • Parallelogram Anatomy
    • Pathway to Proof: Triangle Angles
    • seo tool

    Discover Resources

    • Funktionenschar
    • circumcenter
    • multiples_dinamicas
    • start, create a 135 degree angle
    • Objectives
    • gfwe

    Discover Topics

    • Complex Numbers
    • Mode
    • Piecewise Functions
    • Frequency Distribution
    • Real 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®