Question 466688
The sum of the four horizontal-facing sides on top (labeled 2, 2, 2, unknown) is 11, because if we assume all angles are right angles, we can "slide" the sides over to produce a long side, length 11 cm (only if we had to!). This implies that the unknown horizontal sides is 11 - 2 - 2 - 2 = 5.


Each of the unknown vertical sides is equal to the difference between the two labeled sides, or 2 cm. We can label all the unknown vertical sides and find the perimeter.


I could add up the perimeter by grouping sides together, but in simplicity's sake of using words to type this up instead of diagrams, I will add each side individually, going clockwise.


Perimeter = 11 + 5 + 2 + 2 + 2 + 2 + 2 + 2 + 5 + 3 = 36 cm