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

    • Linear Equation Graphs: Thin Slice
    • Rovnoběžnost rovin
    • Pythagorean Theorem: Quick Illustrator
    • Angle Addition Postulate (V2) - Integer Solutions
    • Writing and Graphing Proportional Relationships (k>0)

    Discover Resources

    • Start, Bisect an angle
    • My GeoGebra book
    • Blank Grid
    • Animation 222
    • construction

    Discover Topics

    • Upper and Lower Sum or Riemann Sum
    • Difference and Slope
    • Cube
    • Piecewise Functions
    • Normal Distribution
    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®