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

Find the area of a triangle whose vertices are (1,-1) ,(-4, 6) and (-3, -5).

Find the area of the triangle vertices are (0, 0), (3, 0) and (0, 2)

Find the area of the triangle whose vertices are : (1) (2,3), (-1, 0), (2,-4) (2) (-5, -1),(3,-5), (5,2)

Find the centroid of the triangle whose vertices are (3, -5), (-7, 4) and (10, -2).

Find the circumcentre of the triangle whose vertices are (2, 2), (4, 2) and (0, 4).

Find the incentre of the triangle ,whose vertices are (3,0),(0,4)and(0,0).

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

Find the circumcentre of the triangle whose vertices are (-2, -3), (-1, 0) and (7, -6). Also find the radius of the circumcircle.

If the area of the triangle formed by the points (2a,b), (a+b, 2b+a) and (2b, 2a) be Delta_(1) and the area of the triangle whose vertices are (a+b, a-b), (3b-a, b+3a) and (3a-b, 3b-a) be Delta_(2) , then the value of Delta_(2)//Delta_(1) is