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The formula for the surface area of a square pyramid is given by:
Surface area = base area + (0.5 * perimeter of base * slant height)
First, calculate the base area:
Base area = (12)^2 = 144
Next, calculate the perimeter of the base:
Perimeter of base = 4 * 12 = 48
Now, substitute these values into the formula:
Surface area = 144 + (0.5 * 48 * 18)
Surface area = 144 + 432
Surface area = 576
Therefore, the surface area of the square pyramid is 576.