# Solved Problem 04 | Rectangular Parallelepiped

**Problem 4**

A packing box 2.2 ft. by 4.9 ft. by 5.5 ft. is to be completely covered with tin. How many square feet of the metal are needed? (Neglect waste for seams, etc.)

**Solution 4**

$A = 2(ab + bc + ac)$

$A = 2 \, [ \, 2.2(4.9) + 4.9(5.5) + 2.2(5.5) \, ]$

$A = 99.66 \, \text{ ft}^2$ *answer*

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