Geometry terminology
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Last updated 5:45 PM on 3/30/23
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14 Terms
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altitude of a triangle
Perpendicular segment from a vertex to the opposite side or to the line that contains the opposite side.
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Orthocenter
the point where all 3 altitudes of the triangle concur.
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median
a segment whose endpoints are a vertex of a triangle and the midpoint of the opposite side.
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centroid
the point of concurrency of the three medians of the triangle.
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angle bisector
a bisector of an angle
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perpendicular bisector
a segment, ray, line, or plane that is perpendicular to a segment at its midpoint.
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circumcenter
point of concurrency of the perpendicular bisectors of a triangle.
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incenter
point of concurrency of the angle bisectors
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centroid=
medians
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circumcenter=
perpendicular bisectors
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incenter=
angle bisectors
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orthocenter=
altitudes
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Which two triangle centers are always inside the triangle?
Incenter + centroid
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Which two triangle centers can be outside the triangle?