Book Maths Puzzle Numerical Ability

find the circumcentre of a triangle whose vertices are(-1,0)(7,-6)(-2,3)

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Book Other Question

the coordinate of centroid of the triangle whose vertices are (3,2),(-3,-1),(0,-1) the length of tangent from point P to a circle of radius 5 cm is 12 cm find the distance of P from the centre of the circle