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

    • End Behavior of Polynomial Functions
    • Modifiable Right Triangular Prism
    • Midpoint Theorem (V2): Integer Solutions
    • Linear Combination of Vectors
    • Basic and Compound Inequality Illustrator

    Discover Resources

    • reflection 12
    • Point of Concurrency of Altitudes - Orthocenter
    • absolute darla
    • Special Right Triangles
    • Копия 3-D Pyramids

    Discover Topics

    • Normal Distribution
    • Fractal Geometry
    • Prism
    • Equilateral Triangles
    • Kite
    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®