Investigation Steps
Click on the 
icon to reset the diagram.
Be sure to show diagrams, explain why and make specific references to what happened when you construct triangles.
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Moving the sliders in this applet lets you construct a triangle by specifying two sides and an angle. If such a triangle can be constructed, is it unique? When ∠ B is 90°, why is the triangle unique? How does this develop into the HL Theorem? Remember, that experiments with specific triangles are not a substitute for a proof for all triangles. |