√18 is between .
8.9 and 9.1
3.1 and 3.2
4.2 and 4.3
4.5 and 4.6

I think it is 8.9 and 9.1

Step-by-step explanation:

because

3.1 its way off so no

4.2 and 4.3 it ehh

but 4.5 and 4.6 it close

hope this helps

Parallel Lines :

Parallel lines are the lines which will never intersect and the perpendicular distance between them will be same at everywhere.  

Perpendicular Lines :

The two lines which have the angle of inclination 90° at the point of intersection are called as perpendicular lines.

Let us look at some examples to understand how to construct parallel and perpendicular lines.  

Example :