Hinge Theorem and Its Converse

Author:Samantha Garcia

In the figure below, AE = BF and AC = BD. Move points E, C, F, and D to change the size of angles A and B. What do you notice about the lengths of EC and FD and their opposite angles?

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Parallel Lines and Angles: Thinking Classroom Exploration
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Angle bisector theorem (external)
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Beweis für 180° in einem Dreieck
Diameter
circumcenter

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