# What must the length of a rectangle be if the with is 12 inches and the perimeter is at least 180 inches? :

Nov 22, 2014

$P = 2 L + 2 W$

$W = 12$

$\implies 180 = 2 L + 2 \left(12\right)$

$\implies 180 = 2 L + 24$

$\implies 156 = 2 L$

$\implies L = 78$