surface area=total area of rectangle
the base total Surface area
=(LW+lw)2
=(8×4+6×3)2
=(32+18)2
=50×2
=100cm²
surface area of a rectangle
4×12
48cm²
SA of another rectangle
5×12
60cm²
Sa of contact base
8×12=96cm²
sa of height rectangle
10×12
120cm²
Sa of another rectangle
6×12
72cm²
area of the top=3×12
36cm²
total area=100cm²+48cm²+60cm²+96cm²+120cm²+72cm²+36cm²
sa=532cm² is the answer
hope it was helpful.
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