Your perimeter of a 5 sided shape is a+b+c+d+e= P (P for perimeter)
add all of your sides of that shape together to get your perimeter
if you post your question i can help..
hope this helps
(a-b)¹²=a¹²-12a¹¹b+...
Let a=2r and b=3s then the second term is -12(2r)¹¹(3s)=-73728r¹¹s.
200 because I looked it up