Search
Google ClassroomGoogle Classroom
GeoGebraGeoGebra Lesson

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

    • 繪畫垂直線
    • Rotating Custom Polygons Around an Axis
    • Squaring a Rectangle (PST Version)
    • Marion's Theorem
    • Mandelbrot

    Discover Resources

    • Sonenshine Right Angle Better
    • Mosaic
    • M 133
    • jaxon medians
    • การบวกจำนวนเต็มบวกกับจำนวนเต็มลบ

    Discover Topics

    • Sequences and Series
    • Upper and Lower Sum or Riemann Sum
    • Rotation
    • Variance
    • Line Segment
    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®