What is the measure of length and width of 18 square feet?

Answer 1

You can't tell the length and width from knowing the area. There are

an infinite number of different possibilities.

Here are a few of them. ALL of these are 18 square feet:

1-ft x 18-ft

1.2-ft x 15-ft

1.5 x 12

1.8 x 10

2 x 9

2.4 x 7.5

3 x 6

3.6 x 5

4-ft x 4.5-ft