<span>A perpendicular bisector is a line that intersects a given segment at a 90° angle, and passes through the given segment's midpoint.</span>
<span>A median of a triangle is a line segment joining a vertex to the midpoint of the opposing side. Every triangle has exactly three medians, one from each vertex, and they all intersect each other at the triangle's centroid. </span> <span>An altitude of a triangle is a line segment
through a vertex and perpendicular to
a line containing the base.</span>
