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GeoGebraGeoGebra Classroom

ASA Triangle Congruence Exploration Euclidean Geometry

ASA Condition Exploration

In this activity we are exploring the ASA (Angle-Side-Angle) Triangle Condition. Adjust the two lengths for the measures of the interior angles of a triangle and the length of the included side by the sliders and/or input boxes. Are there any conditions where there is no triangle possible for the chosen measurements? If so, what conditions do the measurements have to have in order for a triangle to exist? If such a triangle exists, then how many different congruence classes (different sizes of triangles) may result? If two triangles exist and they have two corresponding pairs of congruent angles and the corresponding pair of included sides are congruent, do the two triangles have to be congruent?