Find the third vertex of the triangle whose centroid is origin and two vertices are (2,4,6) and (0,-2,-5).

Find the third vertex of the triangle whose centroid is (7, -2, 5) and whose other two vertices are (2, 6,-4) and (4, -2, 3).

Find the area of the triangle whose vertices are (0,0),(a,0) and (0,b)

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

Find the equations of the sides of the triangle whose vertices are (- 1, 8), (4, - 2) and (- 5,- 3).

Using the integration, find the area of the triangle whose vertices are (-1,6), (1,2) and (5,4) .