How much in feet is 45 square feet?

Honestly it depends at what your looking at

The number can vary.

For example, pretend you have a 5x9

5x9 = 45

5+9= 14

You have 45 square feet and 14 feet

This is another possible combination

30x1.5 = 45

30+1.5=31.5

this time you have 45 square feet and 14 feet.

The combinations are endless