SOLUTION: a square poster board has a perimeter of 12 centimeters. what is the area of the poster board?

Algebra ->  Length-and-distance -> SOLUTION: a square poster board has a perimeter of 12 centimeters. what is the area of the poster board?      Log On


   

Question 600797: a square poster board has a perimeter of 12 centimeters. what is the area of the poster board?
Answer by Rcmathtutor(12) About Me  (Show Source):
You can put this solution on YOUR website!
Perimeter = 4 times one side (since it is a square, all its sides are congruent), then:
P = 4s
Since P = 12:
12 = 4s
Divide both sides of the equation by 4:
12/4 = s
3 = s
so, each side of the square is 3 cm long
Now. Area of the square is side times side, or A+=+s%5E2
Thus A+=+3%5E2
or A+=+9+cm%5E2