Find the point of intersection of the internal bisectors of the angles of a triangle, whose vertices are A(3,0,0),(B(0,4,0) and C(0,0,4).

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

Find the angles of the triangle whose vertices are (0,-1,-2), B(3,1,4) and C(5,7,1).

Find the equations of the bisectors of the interior angles of the triangle whose vertices are A (0, 0) , B (4, 0) and C (0, 3) and prove that they are concurrent.

Find the lenghts of the medians of the triangle with vertices A(0,0,6), B(0,4,0) and C(6,0,0)

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

By using determinants, find the area of the triangle whose vertices are (0,0), (6,0), (4,2)