Vertices of ΔABC are A(1,√3),B(−1,−√3) and C(3,−√3) AB=√4+12=4 BC=√4+12=4 AC=√4+12=4 Here, ABC is an equilateral triangle. ∴ Circumcentre of triangle is (
1−1+3
3
,
√3−√3−√3
3
) =(1,
−1
√3
) [∵ in equilateral triangle circumcentre and centroid coincide]