Arlene wants to create a scale drawing of the poster shown below: a rectangle is shown. the length of the rectangle is labeled 6 inches. the width of the rectangle is labeled 9 inches. what are the dimensions of the poster at one-third its current size?

If you divide each of the lengths by 3, thus giving you the one-third of the finishing size, you'll get 2 inches for the length and 3 inches for the width.
If dimensions is perimeter, you get 2+2+3+3=10
10 inches=Perimeter.

You could also add up the sides and divide them by 3.
6+6+9+9=30
30/3=10 inches