The points 2,3,5,−1,5,−1,4,−3,2forms
Equilateral triangle
isosceles triangle
right angled isosceles triangle
scalene triangle
Given points areA2,3,5,B−1,5,−1,C4,−3,2
The lengths of the sides
AB=9+4+36=49BC=25+64+9=98CA=4+36+9=49
Observing the sides of the triangle, two sides are equal. And square of the one side is sum of squares of other two sides.
Therefore, the triangle is right angled isosceles triangle.