We are going to make a puppy pen using perimeter. Plus everything around it (house, yard, etc.)
We are going to use a piece of graph paper as like the "blueprint" each square equals one foot.
Now say this is your house and backyard you have to find the area of the yard so you can figure out how big the puppy pen can be.
I figured it out and it is a 27 by 27 backyard (on the graph paper). Your puppy pen can be anywhere near that range.
Say you decide to make the puppy pen 17 by 13 ft. That way the puppy can have a whole yard to run around in and have a big puppy pen at the same time
I found the perimeter by adding up 17 ft. + 17 ft. + 13 ft. + 13 ft. =
If you want to find the area you would have to multiply 17 ft. times 13 ft. = 221 square ft.