GeoGebra

Triangle Properties

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The dynamic worksheets below can be used to explore properties that are unique to triangles. The first worksheet contains figures with all angles free to be manipulated, while the second fixes one of the angles to make it easier to manipulate the figure to have certain properties.

http://www.geogebra.org/en/upload/files/milan/Triangles_properties.html

http://www.geogebra.org/en/upload/files/milan/Triangle_properties_one_angle_fixed.html