A right cone has radius 9cm and slant height 12cm. The radius and slant height are both multiplied by 2/3. Which of the followin g correctly describes the effect on the surface area?
       
      
                
     
    
    
    
    1  answer:
            
              
Answer: 
<em>The surface area is multiplied by 4/9.</em>
Step-by-step explanation: 
<u>Surface Area of a Cone</u>
Being r the radius and l the slant height of a cone, then its surface area is
Now let's think both the radius and the slant height are multiplied by the same factor k, i.e.
r'=kr
l'=kl
The new surface area is
The new surface area is the  
The surface area is multiplied by 4/9.
 
                                
             
         	
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