Answer:
20.25π
Step-by-step explanation:
The circumference (C) of a circle is calculated using the formula
C = 2πr ← r is the radius
given C = 9π, then
2πr = 9π ( divide both sides by 2π )
r =  ( cancel the π on numerator/denominator )
 ( cancel the π on numerator/denominator )
   = 4.5
The area (A) of a circle is calculated using the formula
A = πr² = π × 4.5² = 20.25π
 
        
             
        
        
        
Answer:
1260
Step-by-step explanation:
180 x 2
 
        
             
        
        
        
Answer:
D 
Step-by-step explanation:
Cause a square has all equal sides