Question 322005
(1, 1), (4, 5), and (0, 2)
distance between (1, 1), (4, 5),
=sqrt{(4-1)^2+(5-1)^2}
=sqrt{3^2+4^2}
=sqrt25
=5
distance between (4, 5), and (0, 2)
d=sqrt{(0-4)^2+(2-5)^2}
d=sqrt{16+9}
d=sqrt25
=5
distance between (0,2)(1,1)
d=sqrt{(1-0)^2+(1-2)^2}
d=sqrt{1+1)
d=sqrt2

two sides are equal.
so it is an isoscles triangle