A. for the circumference it is C=pi(d)=pi(2r)=pi(10)=  31.4 ft
b. for the area it is A=pi(r)^2=pi(5)^2=pi(25)= 78.5 ft squared
c. since the are is 78.5 ft squared multiply by $4.50= $353.25 to floor the circle.
        
             
        
        
        
By knowing the volume of a triangle and that the triangle has all equal sides
        
                    
             
        
        
        
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Answer:
360 cm cubed
Step-by-step explanation:
Use the volume formula. 
V=whl
V=12 x 6 x 5 
V=360
 
        
             
        
        
        
200mm is the right answer