Ineed to find the perimeter of a shape but i don't know how to solve for the lengths of the sides because they are not straight, the are like this: / i can send a picture for more clarification through some other app

Aprobability experiment is conducted in which the sample space of the experiment is s={7,8,9,10,11,12,13,14,15,16,17,18}, event f={7,8,9,10,11,12}, and event g={11,12,13,14}. assume that each outcome is equally likely. list the outcomes in f or g. find p(f or g) by counting the number of outcomes in f or g. determine p(f or g) using the general addition rule.