# Dilation

• June 24th 2010, 10:08 PM
winsome
Dilation
Given a dilation with the origin O (0, 0), by observation determine the scale factor "K."
• June 24th 2010, 11:38 PM
Hello winsome
Quote:

Originally Posted by winsome
Given a dilation with the origin O (0, 0), by observation determine the scale factor "K."

Take a point $A$ on the original shape. Join it to the origin $O$. Take the image $A'$ of this point on the new shape; join to $O$. The scale factor $k$ of the dilation is given by
$k = \dfrac{OA'}{OA}$