Search
Google ClassroomGoogle Classroom
GeoGebraGeoGebra Classroom

Outline

  1. Triangles
    1. The Angles of a Triangle
    2. Triangles Proofs and Theorems
    3. Practice Problems

    Triangles

    Author:Judith Hilinski
    Topic:Triangles
    The Angles of a Triangle Proving that Triangles are Congruent
    Triangles

    Table of Contents

    • The Angles of a Triangle

      • Basic Definitions: Triangles
      • Triangles and Their Classification
      • Symbols and Examples-Angles in Triangles
    • Triangles Proofs and Theorems

      • Copy of triangle angle-sum theorem
      • Triangle Sum Theorem
    • Practice Problems

      • Practice Problems with Triangles
    Next
    Basic Definitions: Triangles

    New Resources

    • Pythagorean Theorem: Quick Illustrator
    • Pythagorean Theorem: Extension Exercises
    • Function art 3D - waiting shed (v2)
    • Linear Equation Graphs: Thin Slice
    • Slope Illustrator (2)

    Discover Resources

    • Read and Submit Coordinates Quadrant I
    • SnyderRatio
    • Die roll
    • การแก้สมการ
    • H-Right angle Sep2019

    Discover Topics

    • Expected Value
    • Continuity
    • Trigonometry
    • Polynomial Functions
    • Area
    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®