Derived from intersection of median lines, always within triangle
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Orthocentre
Derived from intersection of altitude lines (may need to be extended), can be outside triangle
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Circumcentre
centre of a circle equidistant to vertices, where all triangle vertices lie on circle, derived from intersection of perpendicular bisectors, can be outside triangle
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Median
A line that passes through the midpoint of a triangle and through the opposite vertex
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Altitude
A line that passes through a vertex of a triangle and passes through the opposite side at a 90º angles
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Perpendicular bisector
line that intersects a line segment at a 90º angle and passes through its midpoint
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