Body diagonal

Calculate the length of the body diagonal of a block with dimensions:
a = 20 cm, b = 30 cm, c = 15 cm.

Correct result:

d =  39.0512 cm

Solution:

a=20 cm b=30 cm c=15 cm  d=a2+b2+c2=202+302+152=5 61=39.0512 cm

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