Answer:
P = 5f + 60
Explanation:
The Perimeter of a Regular Shape
A regular shape has sides that are all the same length as each other and angles that are all congruent to each other. The perimeter is the total distance around the outside of a shape.
To find the perimeter of a regular shape, we simply multiply one side length by the number of sides of the shape.
It's given the length of a side of a regular pentagon (n=5) as L=f+12.
The perimeter of the pentagon is 5 times f+12:
P = 5(f + 12)
Operating:
P = 5f + 60