If we slice the vertically the rectangular pyramid, we get a triangle with the base equal to the one of the dimensions of the rectangle, most probably the width. The height of the triangle, however, is dependent as to how far from the center is the slice cut off. Thus, the answer is same shape but of different sizes. 
        
             
        
        
        
C I guess sorry if I get you a low score 
        
             
        
        
        
Answer:
   
Step-by-step explanation:
A suitable common denominator is 4k^2. (This eliminates the first and last choices.)

 
        
             
        
        
        
The answer is 0.6616
Hope it helped :)
        
                    
             
        
        
        
Answer:
I got it.
Step-by-step explanation:
-12a - (-15b) + (-3c)