Surface and volume - cube

Find the surface and volume of a cube whose wall diagonal is 5 cm long.

Correct result:

S =  75 cm2
V =  44.1942 cm3

Solution:

u=5 cm  u2=a2+a2=2 a2  a=u/2=5/2≐3.5355 cm  S=6⋅ a2=6⋅ 3.53552=75 cm2
V=a3=3.53553=44.1942 cm3

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