Use the distance formula. The distance formula is:
[tex]\sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2}[/tex]
If you input the values, you will get:
A to B=[tex]\sqrt{13}[/tex]
B to C=[tex]\sqrt{13}[/tex]
C to D=[tex]\sqrt{13}[/tex]
D to A=[tex]\sqrt{13}[/tex]
It is a square.
Hope that helped!
~Cam943, Moderator
