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=5a³×4a²×7a=140a^6 cm³
luas permukaan= 2(pxl+p×t+l×t)
=2(5a³×4a²+5a³×7a+4a²×7a)
=2(20a^5+35a⁴+28a³)
=(40a^5+70a⁴+56a³)cm²
v=140a^6
8960=140a^6
a^6=8960/140
a^6=64
a^6=2^6
a=2
luas permukaan_=
40(2)^5+70(2)⁴+56(2)³
=40×32+70×16+56×8
1280+1120+448=2848cm²