Calculator for 2x2 determinants

$\mathrm{det\; A}=\left|\begin{array}{cc}{a}_{11}& a_{12}\\ a_{21}& a_{22}\end{array}\right|=a_{11}\cdot a_{22}-\left(a_{21}\cdot a_{12}\right)$

Calculated determinant:

The main diagonal elements are colored green and the scondary diagonal elements are shown in blue color.