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

 

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