3. The length of an edge of a cube is 'x' cm. The total length of its edges is *
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Step-by-step explanation:
Sum of all edges =96cm
⇒12.a=96
⇒a=
12
96
⇒a=8
Length of the edge =8cm
Total surface area =6a
2
=6⋅8⋅8
=6⋅64
=384cm
2
Volume =a
3
=8×8×8
=512cm
3
Difference of volume and total surface area =512−384
=128
∴ So, the answer is 128.
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