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

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- Jun 24th 2010, 09:08 PMwinsomeDilation
Given a dilation with the origin O (0, 0), by observation determine the scale factor "K."

- Jun 24th 2010, 10:38 PMGrandad
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

- Jun 24th 2010, 11:13 PMwinsome
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. - Jun 25th 2010, 12:26 AMZaph
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?