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

    • Pitfalls of Disk/Washer Method
    • Volume by Disk/Washer around y
    • z`]]
    • Making New Year's resolutions for 2026
    • Using Experimental Probability to Estimate π - Monte Carlo Method

    Discover Resources

    • creatPointSeg2
    • Slope Investigator
    • Angles Graphic Organizer 2
    • Mr. Krabs
    • G.SPID.2 Normal Distribution Animation
    • Truchet Tiles: Quarter Circles

    Discover Topics

    • Addition
    • Boxplot
    • Similarity Transformation or Similarity
    • Frequency Distribution
    • Subtraction
    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®