Midsegments Perpendicular Bisectors Angle Bisectors Medians

Median

a segment from a vertex of a triangle to the midpoint of the opposite side

centroid

The point of concurrency of the medians of a triangle

altitude

a segment from a vertex of a triangle that is perpendicular to the line containing the opposite side

Orthocenter

the point of concurrency of the altitudes of a triangle

angle bisector of a triangle

a segment that divides an angle of a triangle into two congruent angles and its endpoints are on the triangle

perpendicular lines of a triangle

is segment that is intersect a side of a trianhle at its midpoint to form right angles

Midsegment

segment of a triangle iff it joins the midpoints of two sides

triangle midsegment theorem

if a segment is the midsegment of s triangle