A rectangle has an area of 7.1m2 (squared). One of the sides is 0.1m in length. Work out the perimeter of the rectangle.

L = length = unknown

W = width = 0.1 meters

A = area = 7.1 square meters

Use the formula for an area of a rectangle. Isolate L

A = L*W

7.1 = L*0.1

0.1*L = 7.1

L = 7.1/0.1

L = 71

The rectangle has a length of 71 meters and a width of 0.1 meters (which multiply to an area of 7.1 square meters)

Now use the perimeter formula

P = 2 * (L+W)

P = 2 * (71+0.1)

P = 2*71.1

P = 142.2

Or you can add up the four sides 71, 71, 0.1, 0.1 and you'll get the same answer.

Final Answer: 142.2 meters