+478 Point $B$ is the image of point $A$ under a dilation with center $O$. If $OB = 30$, and the scale factor of the dilation is $5$, then what is $OA$?
+1950 This question isn't hard at all, and only involves one key fact.
First, we HAVE to know the formula
Dilation Factor = Length of Image / Length of Pre-image
So, now, we just plug in some numbers and we are done!
Length of AB (image) = 30 units
5=30/OAOA=30/5OA=6
So OA is basically just 6 units.
Thanks! :)
