Question

The two figures are regular octagons. Identify the scale factor. Write it in decimal form.

Two regular octagons of different sizes with an arrow pointing from the larger image on the left to the smaller image on the right. Image on the left is labeled fifteen, and image on the right is labeled nine.

Answer 1

I saw the image. A larger octagon measuring 15 becomes a smaller octagon measuring 9.

15 ⇒ 9

larger measure * scale factor = smaller measure

let x be the scale factor:

15 * x = 9
x = 9/15
x = 3/5

The scale factor is 3/5.