I would prefer to write a script to do so. For 2D triangle, if A\B\C are the three nodes, vector AB cross multiply vector AC, and the absolute value is 2 times of its area. For 3D tetrahedron,A\B\C\D are the four nodes, then (vector AB X vector AC)cdoc vector AD is the 6 x volume. You will be able to figure out other cases.