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The lines containing the altitude are congruent.

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The lines containing the altitude of a traibgle are concurrent at the orthocenter of the triangle.

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The perpendicular segment from a vertex to the line containing the opposite site.

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The Centroid is 1/3 of the distance from each vertex to the midpoint of the opposite side

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The point of concurrency in the "Medians".

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A segment of whose endpoints are a vertex and the midpoint of the opposite side.

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The circle that has the incenter as its center is said to be inscribed  In the traingle.

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The point of concurrency of the Angle bisectors >>> Center of circle

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A circle that has the circumcenter as its center is said to be circumcised about the triangle.

Example: Points A, B, C

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The Point of concurrency of a perpendicular bisector of a triangel >>> Center of the Circle

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The bisector of the Angles of a triangle are concurrent at a point equidistance from the sides

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A segment, ray, or line that. intersects a segment at a 90° angle and goes through segment's midpoint.

Example: Segment AB is the Perpendicular Bisector

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The perpendicular bisectors of a side of triangle are congruent at a point of equidistant form the vertex.

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The point at which concurrent lines intersect.
Example: Point "P"

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Three or more points that intersect at one point.