Hi,

If the area of the base of a square pyramid is 28 sq. cm and the total surface area is 64sq. cm



find the area of one triangular face.

 64cm^2 - 28cm^2 = 36cm^2, the sum of the areas of all of the triangular faces. 

 there are 4 faces, all the same size:

  36cm^2/4 = 9cm^2, is the area of one triangular face.

 

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