Question

Estimate the perimeter of the figure the length of one side of each square represents 1 ft

Answer 1

short side is about 3 1/2 squares so 3 1/2 feet
 long side is 7 squares so 7 feet
 perimeter =  7 + 7 + 3 1/2 + 3 1/2 = 21 feet

Answer 2

Hey there! :D

On one side, it looks like 3.5. 

The other side looks like 7.

3.5+3.5+7+7= 21

About 21 ft. is the answer. 

I hope this helps!
~kaikers