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If the points A(1,1), B(-1,-1) and `C(-sqrt(3),sqrt(3))` are the vertices of a triangle isA. right-angledB. isoscles but not right angledC. equilateralD. name of these

Answer» Correct Answer - D
We have,
`AB=2sqrt(2),BCsqrt((3-1)^(2)+(sqrt(3)+1)^(2))=2sqrt(2)`
`and,AC=sqrt((3-1)^(2)+(sqrt(3)+1)^(2))=2sqrt(2)`
`:. AB=BC=CA`
So, `DeltaABC` is equilateral.


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