Work out 2x2 determinant instantly with clear inputs, formula shown and shareable results.
For a 2 × 2 matrix the determinant is ad − bc, the signed area of the parallelogram spanned by the rows. A zero determinant means the rows are parallel and the matrix collapses the plane onto a line.
2×2 determinant
det = ad − bc
1 × 4 − 2 × 3 = −2.
The transformation reverses orientation — it flips the plane as well as scaling it.