Rule: A triangle is determined if one knows two angles and the length of the side between them.
Example: Interactivity: Triangle with ASA Directions for interactivity
In the interactivity, click and drag the sliders for \alpha , c and \beta .
Only "one" triangle exists with the given characteristics, that is, all "such" triangles are congruent.
Click and drag point A to move and point B to rotate (the triangles are congruent).

Example: Interactivity: Construct a triangle with ASA In the interactivity space below, construct a triangle with angle \alpha , side c and angle \beta (ASA). If needed: Directions Get the latest Java Plugin here. 
Related themes:
 Triangle
 Right Triangle
 Congruency, Congruent Triangles
 Similarity, Similar Triangles
 Heron's Formula
 Polygon
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