Answer:
Alternate-exterior angles theorem.
Step-by-step explanation:
Two parallel lines are cut by a transversal, and if there are a pair of congruent angles that are outside of the parallel lines, and on opposite sides of the transversal, you will have the alternate-exterior angles theorem.
 
        
             
        
        
        
Answer: 12 girls to 27 students
5 boys to 9 students
15 boys to 12 girls
HOPE THIS HELPS 
CAN U PLEASE GIVE ME BRAINLIEST
 
        
                    
             
        
        
        
I believe the answer is 40
        
             
        
        
        
I think B not 100%shure ,you could prob go ask this on yahoo and get a bit more help ;) sorry I couldent help more
        
                    
             
        
        
        
C=8πab
Divide both sides by 8πb
c/(8πb) = a