Quick student-centered engaging activity in which Ss use GeoGebra to construct a triangle that ALWAYS remains ISOSCELES & DISCOVER the ISOSCELES TRIANGLE THEOREM

Use the tools of GeoGebra (in the embedded applet below) to construct a triangle that ALWAYS REMAINS ISOSCELES. After doing so, find and display the measures of its 3 angles.

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Select the MOVE arrow. Now drag any one (or more) of this isosceles triangle's 3 vertices around. What do you notice? Explain.

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