Question

a vertex of degree zero is called __________ vertex

Answer 1

a vertex of zero degree is called isolated vertex

Answer 2

Concept:

This question is from graph theory.

Graph theory is the field of mathematics in which we learn about mathematical structures which we construct referring to a problem (maybe a real-life problem)

Given:

A vertex of degree zero is called __________ vertex

To find:

We are asked to find what is that vertex which is of zero degrees and fill in the blank

Solution:

The degree of a vertex in a graph is the number of edges that are incident to the vertex.

So, a vertex of zero degrees will mean it does not have any incident edge.

Thus, a vertex of zero degrees is called an isolated vertex.