So use half the surface area formula: SA=2πr^2 and plug in what you already know
since you don't know the radius yet, solve for it using the circumference
C=2πr
514.96=3.14(2)r
82=r
SA=2π(82)^2
SA=6.28(6724)
SA=42,226.72
so your answer is 42,226.72 yards squared
        
             
        
        
        
this is puberty and young adults are people who are between 18 and 24 but an emerging adult can be any where from 12 to 30
 
        
             
        
        
        
Answer:
The children are experiencing natural reinforcement.
Explanation:
Sandra's children are very successful in school and that is a stated natural reinforcer. 
Natural reinforces occur as a result of their behavior without involving others expressing their approval of their behavior.
Sandra is trying to foster this natural reinforcement with positive social reinforcement, "but she does not always remember".
 
        
             
        
        
        
Answer:
The preamble establish the goals and purposes of the us
 
        
             
        
        
        
Parents practicing authority over children