Cube diagonals

Determine the volume and surface area of the cube if you know the length of the body diagonal u = 216 cm.

Correct result:

V =  1939453.4995 cm3
S =  93312 cm2

Solution:

u=216 a=u/3=216/3=72 3≐124.7077 V=a3=124.70773=1939453.4995 cm3=1.939453⋅106 cm3
S=6⋅ a2=6⋅ 124.70772=93312 cm2

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