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Copy of Quadrilaterals - Sum of Angles
Author:
Dakota Doran
,
Glen Reesor
Show that the sum of interior angles in any quadrilateral is 360 degrees
Moveable points: A, B, C, D
GeoGebra
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alg2_05_05_01_applet_exp_2_flvs
Explore the invariant lines of matrix {{-2,5},{6,-9}}
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Equilateral Triangles
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