Task

I have homework.
The cube has an edge 7 cm long and I must find wall and body diagonal.

Correct result:

d1 =  9.9 cm
d2 =  12.1244 cm

Solution:

d1=a2+a2=2a=2⋅7=9.9 cm
d2=d12+a2=2a2+a2=3a=3⋅7=12.1244 cm

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