Internal angle sum of triangles

Author:mrsK

- Drag the vertices A, B, C to create different types of triangles. - Use the sliders to create copies of the same triangle and prove that the internal angles always add up to 180 degrees.

New Resources

Probabilities with Two-Way Tables
Writing and Graphing Proportional Relationships (k>0)
Choosing a Method to Find Triangle Area
Squaring a Rectangle (PST Version)
Angle Addition Postulate (V2) - Integer Solutions

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triangle thingy
Domain & Range: Illustrated v2
Opposite angles of Cyclic Quad
NTI Water Park Project

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Integers
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