I have this project to do about crosses and I can't think of what the answer is for the following questions: What is the area rule of the crosses (the table below will help you)? 
 | Cross Number | Area  sq  cm | 
 | 1 | 5 | 
 | 2 | 13 | 
 | 3 | 25 | 
 | 4 | 41 | 
 | 5 | 61 | 
 
     I also need to know what the formula is for it?