Answer:
9 units.
Step-by-step explanation:
In a square, all sides have the same length. So in this question, the distance between any of these two points is the length of a side.
Distance between two points.
Point A(x1, y1)
Point B(x2,y2)
The distance is given by:
[tex]D=\sqrt{(x2-x1)^2+(y2-y1)^2}[/tex]In this question:
I am going to draw the square
The length of the side can be the distance between any of these points:
A and B, B and C, C and D or A and D.
I am going to use A and D.
A(-8,-8)
D(1,-8)
[tex]D=\sqrt{(1-(-8))^2+(-8-(-8))^2}=\sqrt{(9)^2+(0)^2}=\sqrt{81}=9[/tex]The length of one side is of 9 units.9 units.