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By using pythagorean you will get the slant height
l = sqrt((18^2)+(4^2))
the 4 is the half of the base
l = 2sqrt(85)
LSA = 1/2Pl where P is the perimeter of the base and l is the slant height
LSA = 1/2(32)(12sqrt(85))
LSA = 32sqrt(85) or 295.03 sq. cm<===ANSWER

Volume = 1/3Bh
since the base is square the formula for B=s^2
B=8^2=64 and h=18
V=384 cu. cm <=====ANSWER

TSA = 64+295.03
TSA = 359.03 sq cm <====ANSWER

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