Step-by-step explanation:
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As we know the radius and slant height, we can use Pythagoras' Theorem to find the perpendicular height. 
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Now substitute this into the volume formula.
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Answer:
A.  
 
Step-by-step explanation:
Central angle of shaded part
 
 
Radius (r) = x unit
Area of the shaded part of  
 
 
 
 
 

 
        
             
        
        
        
Answer:2/5
Step-by-step explanation:
 
        
             
        
        
        
 It would take 9 people 34.5 minutes to paint 9 walls.
23 divided by 6 equals 3.83. That is how many minutes it takes one person to paint one wall. Multiply 3.83 by 9 and you get your answer, 34.5 minutes.