Math CentralQuandaries & Queries


Question from tonya, a parent:

What is the scale factor for the two figures regular octagon with 15 and 9 written in decimal form

Hi Tonya,

I imagine an image that is something like his.


I am going to assume that the numbers 9 and 15 are the lengths of the sides of the respective octagons. A scale factor is between lengths so going from the smaller octagon to the larger the scale factor would be the number $k$ so that $9 \times k = 15.$ Hence

\[k = \frac{15}{9} = \frac{5}{3}.\]

Let me know if my assumption is incorrect.


About Math Central


Math Central is supported by the University of Regina and the Imperial Oil Foundation.
Quandaries & Queries page Home page University of Regina