Surface area of 5 sides of square = 5a²= 5×8.2×8.2=336.2 Cm²
Surface area of pyramid= a²+2a √a²/4+h²= 8.2²+2×8.2√67.24/4+ 4.41= 142.79
Surface area of composite shape = 336.2+142.79-67.24= 411.75~ 411.8 Cm² !
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