Question

A regular octagon has side length 10.9 in. The perimeter of the octagon is 87.2 in cm and the area is 392.4 in2. A second octagon has side lengths equal to 5.45 in. Find the area of the second octagon. Please help

Answer 1

@stgreen do you know this one?

Answer 2

When the sides of polygons are related by a scale factor, the areas are related by the square of the scale factor.

Answer 3

I still don't get how to do it

Answer 4

Look at the figure.

Answer 5

There are two squares.

The square at left with side of 6 cm has an area of 36 cm^2.
The square at right with side 3 cm has an area of 9 cm^2.

Ok so far?