Devin Ervin

a line joining the midpoints of two sides of a triangle.

three or more lines in a plane or higher-dimensional space that if they intersect at a single point.

The point where the three perpendicular bisectors of a triangle meet.

a line segment joining a vertex to the midpoint of the opposing side.

the point where the three medians meet.

is a straight line through a vertex and a perpendicular line containing the base.

The point where the three altitudes of a triangle intersect.