Given a dilation with the origin O (0, 0), by observation determine the scale factor "K."
Hello winsomeTake a point $\displaystyle A$ on the original shape. Join it to the origin $\displaystyle O$. Take the image $\displaystyle A'$ of this point on the new shape; join to $\displaystyle O$. The scale factor $\displaystyle k$ of the dilation is given by$\displaystyle k = \dfrac{OA'}{OA}$Grandad