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  2. Median (geometry) - Wikipedia

    en.wikipedia.org/wiki/Median_(geometry)

    In geometry, a median of a triangle is a line segment joining a vertex to the midpoint of the opposite side, thus bisecting that side. Every triangle has exactly three medians, one from each vertex, and they all intersect at the triangle's centroid .

  3. Midpoint - Wikipedia

    en.wikipedia.org/wiki/Midpoint

    In an isosceles triangle, the median, altitude, and perpendicular bisector from the base side and the angle bisector of the apex coincide with the Euler line and the axis of symmetry, and these coinciding lines go through the midpoint of the base side.

  4. Concurrent lines - Wikipedia

    en.wikipedia.org/wiki/Concurrent_lines

    Perpendicular bisectors are lines running out of the midpoints of each side of a triangle at 90 degree angles. The three perpendicular bisectors meet at the circumcenter. Other sets of lines associated with a triangle are concurrent as well. For example: Any median (which is necessarily a bisector of the triangle's area) is concurrent with two ...

  5. Bisection - Wikipedia

    en.wikipedia.org/wiki/Bisection

    The interior perpendicular bisector of a side of a triangle is the segment, falling entirely on and inside the triangle, of the line that perpendicularly bisects that side. The three perpendicular bisectors of a triangle's three sides intersect at the circumcenter (the center of the circle through the three vertices). Thus any line through a ...

  6. List of triangle inequalities - Wikipedia

    en.wikipedia.org/wiki/List_of_triangle_inequalities

    The parameters in a triangle inequality can be the side lengths, the semiperimeter, the angle measures, the values of trigonometric functions of those angles, the area of the triangle, the medians of the sides, the altitudes, the lengths of the internal angle bisectors from each angle to the opposite side, the perpendicular bisectors of the ...

  7. Cevian - Wikipedia

    en.wikipedia.org/wiki/Cevian

    1.2 Median. 1.3 Angle bisector. ... Medians and angle bisectors are special cases of cevians. ... If the cevian happens to be an altitude and thus perpendicular to a ...

  8. Altitude (triangle) - Wikipedia

    en.wikipedia.org/wiki/Altitude_(triangle)

    In geometry, an altitude of a triangle is a line segment through a given vertex (called apex) and perpendicular to a line containing the side or edge opposite the apex. This (finite) edge and (infinite) line extension are called, respectively, the base and extended base of the altitude.

  9. Isosceles triangle - Wikipedia

    en.wikipedia.org/wiki/Isosceles_triangle

    the altitude, a line segment from the apex perpendicular to the base, [15] the angle bisector from the apex to the base, [15] the median from the apex to the midpoint of the base, [15] the perpendicular bisector of the base within the triangle, [15] the segment within the triangle of the unique axis of symmetry of the triangle, and [15]