Find the co-ordiantes of the orthocentre of triangle whose angular points are (3,-1),(-1,2),(0,0)`.

Find the coordinates of the orthocentre of the triangle whose vertices are (1, 2), (2, 3) and (4, 3).

Find the coordinates of the centroid of the triangle whose vertex are (1,-2),(3,2)and (-1,0).

Find the co-ordinates of the circumcentre of the triangle whose vertices are : (-2, 2) , (2, - 1) and (4, 0).

Find the co-ordinates of the circumcentre of the triangle whose vertices are : (1, 2) , (3, - 4) and (5,-6).

Find the co-ordinates of the centroid of the triangle whose vertices are (x_(1),y_(1),z_(1)), (x_(2),y_(1),z_(2)) and (x_(3),y_(3),z_(3)) .

Find the coordinates of the centroid of a triangle the mid points of whose sides are (1,2,-3), (3,0,1) and (-1,1,-4)

Find the area of the triangle formed by joining the mid-points of the sides of the triangle whose vertices are (0, -1), (2, 1) and (0, 3). Find the ratio of the area of the triangle formed to the area of the given triangle