Show that the points `A(0,1,2),B(2,-1,3)a n dC(1,-3,1)` are vertices of an isosceles right-angled triangle.

Explanation

Given,`A(0,1,2),B(2,-1,3),C(1,-3,1)
so,AB`=`sqrt((2−0)^2+(−1−1)^2+(3−2)^2)
​=3`


BC=`sqrt((2−1)^2+(−1+3)^2+(3−1)^2)
​=3`


CA=`sqrt((1−0)^2+(−3−1)^2+(1−2)^2)
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