The triangle with vertices at $(-2,2),(2,-2)$ and $(1,1)$ is
The triangle with vertices at $(-2,2),(2,-2)$ and $(1,1)$ is
scalene triangle
equilateral triangle
isosceles triangle
right-angled triangle
Solution
Let $A(-2,2), B(2,-2)$ and $C(1,1)$ are the vertices of $\triangle A B C$.
$
\begin{array}{r}
A B=\sqrt{(2+2)^2+(-2-2)^2}=\sqrt{4+4}=4 \sqrt{2} \\
B C=\sqrt{(1-2)^2+(1+2)^2}=\sqrt{1+9}=\sqrt{10} \\
A C=\sqrt{(1+2)^2+(1-2)^2}=\sqrt{9+1}=\sqrt{10}
\end{array}
$
$\triangle A B C$ is an isosceles triangle