www.calculatorsoup.com/calculators/construction/square-footage-calculator.php

www.squarefootage.org/square-footage-calculator.php

Directions: Enter any combination of feet and/or inches into the calculator below.
You can use this

www.calculator.net/square-footage-calculator.html

www.thecalculatorsite.com/misc/square-footage-calculator.php

Use this

www.reference.com/math/formula-calculate-square-feet-79f0faa2b54fdc0a

The

www.khanacademy.org/math/algebra/quadratics/quadratics-square-root/a/solving-quadratic-equations-by-taking-square-roots

You might find this confusing because the

en.wikipedia.org/wiki/Quadratic_equation

In elementary algebra, a quadratic

www.purplemath.com/modules/solvquad2.htm

On the left-hand side of this particular