Question 414108
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Hi
The surface area of a pyramid with a 7 in. x 7 in. square base is 105 ft sq. 
 7*7 = 49   105-49 = 56 = 4(1/2)7s    (where s is the slant height of the four triangular faces)
 56 = 4(1/2)7s 
 56/14 =  s
    s = 4in
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/9/91/Pyramid.svg/200px-Pyramid.svg.png">