# Wall and body diagonals

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

Correct result:

u1 =  5 cm
u2 =  12.369 cm
u3 =  12.649 cm
d =  13 cm

#### Solution:

$a=4 \ \text{cm} \ \\ b=3 \ \text{cm} \ \\ c=12 \ \text{cm} \ \\ \ \\ u_{1}=\sqrt{ a^2+b^2 }=\sqrt{ 4^2+3^2 }=5 \ \text{cm}$
$u_{2}=\sqrt{ b^2+c^2 }=\sqrt{ 3^2+12^2 }=3 \ \sqrt{ 17 }=12.369 \ \text{cm}$
$u_{3}=\sqrt{ a^2+c^2 }=\sqrt{ 4^2+12^2 }=4 \ \sqrt{ 10 }=12.649 \ \text{cm}$
$d=\sqrt{ a^2+b^2+c^2 }=\sqrt{ 4^2+3^2+12^2 }=13 \ \text{cm}$

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