In the figure below, the angles of triangles 1 and 2 which have the same color are congruent. The side between the two angles of the two triangles are also congruent.

The ASA triangle congruence postulate (actually, it's a theorem), states that if the two corresponding angles of two triangles are congruent, and the corresponding included sides are congruent, then the two triangles are congruent.

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This article is sponsored by Euroffice for office whiteboards.

- Move the vertices of triangle ABC. What do you observe?
- Use the tools provided to investigate the triangle. List your observations.
- Make a conjecture of what you have observed.

The ASA triangle congruence postulate (actually, it's a theorem), states that if the two corresponding angles of two triangles are congruent, and the corresponding included sides are congruent, then the two triangles are congruent.

***

This article is sponsored by Euroffice for office whiteboards.

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