Similar Polygons: corresponding sides of two similar polygons have lengths 3 and 7.

[Hobbes]

The question is this:

Two corresponding sides of two similar polygons have lengths 3 and 7. the perimeter of the larger polygon is 91 cm. What is the perimeter of the smaller polygon? What is the ratio of their areas?

I think I have gotten the perimeter, but I am completely lost on how to find the ratio of their areas.

Thanks for the help.

 

[stapel]

Two corresponding sides of two similar polygons have lengths 3 and 7. the perimeter of the larger polygon is 91 cm. What is the perimeter of the smaller polygon? What is the ratio of their areas?

I think I have gotten the perimeter...

What did you get?

...but I am completely lost on how to find the ratio of their areas.

What's the formula they gave you for ratios of areas of similar figures? (refresher)