In Euclidean geometry two triangles are known to be congruent if two corresponding angles and the side they contain are congruent. Two angles and the side are congruent if they have the same measure. This is called ASA congruence. ASA stands for angle, side, angle.
In figure 1, angles A and A' are congruent, angles B and B' are congruent and line segment AB is congruent with line segment A'B'. Click and drag the blue points in the manipulative 1 to change it.
|Manipulative 1: Congruent triangles by ASA congruence. Created with GeoGebra|
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