Determinant and Triangle
Algebra
Level
3
Triangle \(\triangle ABC\) has vertices \(A=(a,b),\) \(B=(c, d)\) and \(C=(0,0).\) If \(\det\left[\begin{array}{cc}a& b\\c& d \end{array}\right]=4,\) what is the area of \(\triangle ABC\)?
by
Sandeep Mehra