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Step-by-step explanation:
6. cube =4a^2
4×12^2
=4×144
=488sq cm
8.cuboid=2h(l+b)
=2(5.2)(12.5+4)
=16.4(16.5)
=171.6
7.cuboid=2h(l+b)
=2(7)(16+5)
=14(21)
294
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