Triangles

What makes a triangle equilateral, isosceles, or scalene?

How are these triangles the same? How are they different? Manipulate the triangles by dragging their blue corner points. What happens to their side lengths?

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The Cosine Formula - Proof Without Words
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The black friday GeoGebra :)
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vector practice
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Average Rate of Change for Quadratic Functions
Thales3
Rekenrek for LZ 2

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Random Experiments
Hypergeometric Distribution
Division
Distributions
Secant Line or Secant