The coordinates of the vertices of ∆ABC are A(4, 1), B(-3, 2) and C(0, k). Given that the area of ABC is 12 unit2, find the value of k.
Let the given points be A(cos ө, -sin ө) and B(-cos ө, sin ө).
We know that distance between two points A(x1, y2) and B(x2, y2) is given by