Please help me figure this out!!!!!!

The answer is 129.13 is your answer. Remember, the perimeter of the base is 4s since it is a square. There is no formula for a surface area of a non-regular pyramid since slant height is not defined. To find the areafind the area of each face and the area of the base and add them.

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Total surface area of pyramid = area of base + area of 4 triangular faces

area of base = 6.4*6.4 = 40.96 cm²
area of one triangular face = 1/2 * 6.4 * 6.1 = 19.52 cm²

Surface area of pyramid = 40.96 + 4 * 19.52 = 119.04 cm²

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