Question

What is the perimeter of a entire football field including the end zones?

Answer 1

$P=2L+2l \\ L=120 \ m \\ l=90 \ m \\ \Rightarrow P=2 \cdot 120 \ m +2 \cdot 90 \ m=2(120 \ m+90 \ m)=2 \cdot 210 \ m \\ \Rightarrow \boxed{P=420 \ m}$