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Triangles are congruent if any pair of corresponding sides and their included angles are equal in both triangles.

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Triangles are congruent if two pairs of corresponding angles and a pair of opposite sides are equal in both triangles.

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Triangles are congruent if all three sides in one triangle are congruent to the corresponding sides in the other.

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An angle formed between parallel lines by a third line that intersects them.

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The angle between a side of a rectilinear figure and an adjacent side extended outward.

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The relation between two expressions that are not equal.

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The base angle is the base of a triangle or the bottom angle of a triangl

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Two triangles are congruent if any two angles and their included side are equal in both triangles.

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The angle associated with a given vertex.

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A line segment through a vertex and perpendicular to a line containing the base .

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A point of of concurrency of a triangle. A point where all 3 medians intersect.

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The point at which the perpendicular bisectors of the sides of a triangle intersect.

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A line segment joining a vertex to the midpoint of the opposing side, bisecting it.

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The point of concurrency of the three altitudes of a triangle.

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Three or more lines in a plane that intersect at a single point.

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A segment connecting midpoints of two sides of a triangle.