Surface of the cube

Find the surface of the cube that has volume
1/1m3
2/0.001 m3
3/8000 mm3

Correct result:

S1 =  6 m2
S2 =  0.06 m2
S3 =  2400 mm2

Solution:

V1=1 m3 V=a3 a1=V13=13=1 m S1=6⋅ a12=6⋅ 12=6 m2
V2=0.001 m3 a2=V23=0.0013=110=0.1 m S2=6⋅ a22=6⋅ 0.12=350=350 m2=0.06 m2
V3=8000 mm3  a3=V33=80003=20 mm S3=6⋅ a32=6⋅ 202=2400 mm2

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