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If A ,B ,C have position vectors (2,0,0...

If `A ,B ,C` have position vectors `(2,0,0),(0,1,0),(0,0,2),` show that ` A B C ` is isosceles.

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A,B,C are `(2,0,0) ,(0,1,0 and (0,0,2)`

so,
`AB=-2hati+hatj`
`BC=-jati+2hatj`
`CA=-2hati+2hatj`
So,
`mod(AB)=mod(BC)` ...
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