The perimeter of a rectangle is 12 centimeters. The length of a rectangle is 3 centimeters. What is the area of the rectangle

Recall that the equation to find the perimeter of a rectangle is 2(L + w)

Since we know the length, we can make an equation:

2(3 + w) = 12

Divide both sides by 2:
(3 + w) = 6
w = 3

Now that we know both length and width, we simply have to find their product to solve for area:

a = L * w
a = 3 * 3
a = 9

The area of the rectangle is 9 cm^2.