find the distance between each
between points (x1,y1) and (x2,y2)
D=\(\sqrt{(x2-x1)^2+(y2-y1)^2}\)
find and verify that
BC=CD=DE=EB
so
BC=\(\sqrt{(0-(-5))^2+(6-1)^2}\)=5√2
CD=\(\sqrt{(5-0)^2+(1-6)^2}\)=5√2
DE=\(\sqrt{(-4-1)^2+(0-5)^2}\)=5√2
EB=\(\sqrt{(-5-0)^2+(1-(-4))^2}\)=5√2
true
