TOPIK POPULER

Rotasi matriks terhadap pusat P (a,b)

\(= \begin{pmatrix} \cos\theta & -\sin\theta \\ \sin\theta & cos\theta \end{pmatrix} \begin{pmatrix} x-a \\ y-b \end{pmatrix} + \begin{pmatrix} a \\ b \end{pmatrix}\) dimana \(x' = (x-a) \cos \theta - (y-b) \sin \theta + a \\y' = (x-a) \sin \theta + (y-b) \cos \theta + b \)