Suppose I have a 2D matrix as such: $\begin{bmatrix} 1 &0 &0\\ 0 &1 &0\\ 0 &0 &1\\ \end{bmatrix} $
If I apply a rotation of 180 degrees and a scale of 2, what will my resultant matrix look like? Also, given another matrix (example below), how do I get the angle it was rotated and the scale?
$\begin{bmatrix} 1.4 &0.12 &0\\ -0.12 &1.4 &0\\ 0 &0 &1.0\\ \end{bmatrix} $ I apologise in advance- I'm not a math major and this is most definitely not homework. I just want to apply this knowledge in transforming images (I'm making an app). Thanks!