Wall and body diagonals

The block/cuboid has dimensions a = 4cm, b = 3cm, and c = 12cm. Calculate the length of the wall and body diagonals.

Correct answer:

u1 =  5 cm
u2 =  12.3693 cm
u3 =  12.6491 cm
d =  13 cm

Step-by-step explanation:

a=4 cm b=3 cm c=12 cm  u1=a2+b2=42+32=5 cm
u2=b2+c2=32+122=3 17=12.3693 cm
u3=a2+c2=42+122=4 10=12.6491 cm
d=a2+b2+c2=42+32+122=13 cm

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