Thanks for the help on my previous question, but I am struggling to find a way to solve the following problem:

Prove that the area A(a,b,c) of the triangle in the complex plane with corners at a,b,cEC, ordered in anti-clockwise fashion, is given by the formula:

A(a,b,c)= i/4*(a*b'-a'*b+b*c'-b'*c+c*a'-c'*a).

Many thanks to anyone who is able to help.