Transforation geometry -- using matrices!
This is a question from GCSE level, so please offer a simple explanation if possible. :)
I have been given the following:
To rotate a point (x,y) 90deg anti-clockwise, pre-multiply the x y matrix with:
Similarly, for a an anti-clockwise rotation of 180deg, it's:
p.s., how can I create a matrix in this forum in the math tag?
It's tough to remember so memorize so many matrices when there are very similar looking matrices for reflection (on x axis, y axis and y = -x). I think perhaps, an explanation of how these matrices are created will help me. Or maybe some pointers on how to memorize at least 8-9 such matrices.