Cuboid Formulas

1. Surface Area

$\mathrm{Surface\; Area}=2\times (lw+lh+wh)$

Sum of twice the areas of distinct faces.

2. Volume

$\mathrm{Volume}=l\times w\times h$

Product of length, width, and height.

3. Diagonal

$\mathrm{Diagonal}=\sqrt{l^2+w^2+h^2}$

Straight-line distance between opposite corners.

4. Face Diagonal

$\mathrm{Face\; Diagonal}=\sqrt{l^2+w^2}$

Diagonal of one rectangular face (e.g., l × w).

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