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In geometry, a median of a triangle is a line segment joining a vertex to the midpoint of the opposing side, bisecting it.

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three or more lines in a plane or higher-dimensional space are said to be concurrent

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The point where the three "altitudes" of a triangle meet.

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There is a special triangle called an isosceles triangle.

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There are other special symbols that show in what way things are not equal.

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

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

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A midsegment is the line segment connecting the midpoints of two sides of a triangle.

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A midsegment is the line segment connecting the midpoints of two sides of a triangle.

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circumcenter is the point where the perpendicular bisectors of a triangle intersect.

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The Centroid is a point of concurrency of the triangle.

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an altitude of a triangle is a line segment through a vertex and perpendicular to a line containing the base.

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each angular point of a polygon, polyhedron, or other figure.

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