Search
Google ClassroomGoogle Classroom
GeoGebraGeoGebra Classroom

Outline

  1. Adding the Angles in a Triangle: IM 8.1.15
    1. Lesson 8.1.15
    2. Practice 8.1.15

    Adding the Angles in a Triangle: IM 8.1.15

    Author:GeoGebra Classroom Activities
    Topic:Angles, Geometry, Triangles
    “Adding the Angles in a Triangle” from IM Grade 8 by Open Up Resources and Illustrative Mathematics. Licensed under the Creative Commons Attribution 4.0 license.
    Adding the Angles in a Triangle: IM 8.1.15

    Table of Contents

    • Lesson 8.1.15

      • IM 8.1.15 Lesson: Adding the Angles in a Triangle
    • Practice 8.1.15

      • IM 8.1.15 Practice: Adding the Angles in a Triangle
    Next
    IM 8.1.15 Lesson: Adding the Angles in a Triangle

    New Resources

    • 繪畫垂直線
    • Perpendicular Lines: Quick Exploration
    • Writing and Graphing Proportional Relationships (k>0)
    • Midpoint Theorem (V2): Integer Solutions
    • Rovnoběžnost rovin

    Discover Resources

    • Statistical analysis of Y9 data
    • Sum of Interior Angles of a Triangle
    • Arc Length Exploration
    • Exploring Side Angle Angle Triangles
    • day 107

    Discover Topics

    • Boxplot
    • Equilateral Triangles
    • Tangent Line or Tangent
    • Logic
    • Geometric Transformations
    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®