Body diagonal

The cuboid has a volume of 32 cm3. Its side surface area is double as one of the square bases. What is the length of the body diagonal?

Correct result:

u =  6 cm

Solution:

V=a2 c=32 4⋅ a⋅ c=2 a2 2c=a 4c2 c=32 c3=8 c=83=2 a=2⋅ c=2⋅ 2=4 u=a2+a2+c2=42+42+22=6 cm

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