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Assuming 15b means the lengths of each side of the square base and 12l means the length of the triangle from the top to the bottom (note that I'm not assuming 12l is the height of the pyramid) the SA (surface area) will be:

15^2 + 15x12x4/2 = 225 + 360 = 585 units squared (whatever your units are)

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Q: What is the surface area of a square pyramid with 15b 12l?
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