A point on a segment that is halfway between the two endpoints is called the midpoint of the segment. It is the point that divides the segment into two equal parts.
It is called a diagonal.
2D shape
A tetrahedron, assuming the four vertices are not coplanar.
Four vertices Four equal sides Four equal angles
A line between 2 vertices in Graph theory is called an edge or an arc, although arc is usually used to denote a directed edge.
Topology.
Midpoint
A line between two verticies is called a line segment.
The line is called a diagonal if it is drawn between two nonadjacent angles.
a middle point
The apex Points of a triangle are called as vertices or else the points where two line segments meet is called as Vertices.
A side (2-dimensions) or edge (3-dimensions).
Yes, if its one corner it is called Vertex, but if its corners ,its called Vertices.
A point on a segment that is halfway between the two endpoints is called the midpoint of the segment. It is the point that divides the segment into two equal parts.
It is called a diagonal.
2D shape