Question

why we are taking the unit of distance in graph as 4 units or 5units​

Answer 1

Step-by-step explanation:

please ask your teacher they tell more clearly

Answer 2

Answer:

This graph is called the unit distance graph. Well: to get a lower bound, it suffices to consider finite graphs G that we can draw in the plane using only straight edges of length 1. Because our graph on R2 must contain any such graph “inside” of itself, examining these graphs will give us some easy lower bounds.