The perimeter of the figure below is 133.6 .find the length of the missing side please don’t answer the question if u don’t know it

Answer:
20.5 cm
Step-by-step explanation:
The perimeter of a shape is the lengths of all the sides.
Add up all the given sides in the picture and you get 93.1
Subtract 113.6 - 93.1 and you get 20.5