# Math Help - Dilation

1. ## Dilation

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

2. Hello winsome
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
$k = \dfrac{OA'}{OA}$
Grandad

3. Given a dilation with the origin O (0, 0), by observation determine the scale factor "K."
DO, K = (5, 0) (10, 0)
The dilation an expansion.

4. Try visualize it, you got two lines on the x-axis. One goes from 0 to 5, we call that l, and the other goes from 0 to 10 which we call m. How much 'longer' is m compared to l?