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the sides of the cubical box would be 7 meters
If it is a cubical block, the volume is simply length x height x width.
This depends on what you mean by "it". The volume of the original cube is V = (80 cm)³ = 512,000 cm³. If the volume is decreased by 10%, then multiply the volume of the original cube by 0.9 to get 406,800 cm³. Otherwise, if the length of the cube is decreased by 10%, then: V = (80 cm * 0.9)³ ≈ 373248 cm³
The volume of a cube depends on the length of its side.
The new area is 22 = 4 times the original area. The new volume is 23 = 8 times the original volume.