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GeoGebraGeoGebra Classroom

Hinge Theorem

Triangle ABC and Triangle XYZ

What are the same in triangle ABC and triangle XYZ?

Drag point B to see how the inscribed angle affects the length of the third side.

Drag point B to make A > X. Compare side BC with side YZ.

Drag point B to make A<X. Now compare side BC with side YZ.