First slide
Introduction to 3-D Geometry
Question

The points  2,3,5,1,5,1,4,3,2forms

Easy
Solution

Given points areA2,3,5,B1,5,1,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. 

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