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Find the coordinates of circumcentre of ...

Find the coordinates of circumcentre of a triangle whose vertices are `(-3, 1), (0, -2) and (1, 3)`

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Total number of points within the square `OACB=20xx20=400` there are 20 points on the line AB which are `(1,20), (2,19),......(20,1)`.
`therefore` Points within `Delta OAB` and `DeltaABC= 400-20=380` by symmetry, points within `DeltaOAB=(380)/(2)=190`
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