Question

I've been stuck on this for a while. Can someone please help me?

Answer 1

check the picture below.

notice, the apothem is 6, the length of a side is 5 units, that means the perimeter, namely the sum of all sides, is 5+5+5+5+5+5+5+5.

$\bf \textit{area of a regular polygon}\\\\ A=\cfrac{1}{2}(apothem)(perimeter)$