the forumal is to add (sum) all the sides of the polygon.
the perimter of a pentagon is outside of the the pentegon. count what is in the outside
Cl2
C2H6
etyghviugui
It is the sum of its 4 equal sides.
40 cm
add all of the sides together.
measure the distance around the outside
(pi) times (the diameter of the circle)
18
the outside of the shape
Perimeter = 4*1.25 = 5m