6/8-3/8
3/8
the answer to 3/4-3/8 is 3/8
        
             
        
        
        
A pyramid is regular if its base is a regular polygon, that is a polygon with equal sides and angle measures. 
(and the lateral edges of the pyramid are also equal to each other)
Thus a regular rectangular pyramid is a regular pyramid with a square base, of side length say 
x.
The lateral faces are equilateral triangles of side length 
x.
The lateral surface area is 72 cm^2, thus the area of one face is 72/4=36/2=18  cm^2.
now we need to find 
x. Consider the picture attached, showing one lateral face of the pyramid.
by the Pythagorean theorem: 

thus, 

thus:

       (cm^2)
but 

 is exactly the base area, since the base is a square of sidelength = 
x cm.
So, the total surface area = base area + lateral area =  

   cm^2
Answer: 

   cm^2
 
        
        
        
Answer:
16
Step-by-step explanation:
 
        
             
        
        
        
Answer: 1/8
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