A cereal box has a length of 8 inches, a width of 2.5 inches and a height of 12 inches. The cereal box is made completely of cardboard. What is the least amount of cardboard needed to make the cereal box?

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Answer 1 · 2018-03-25T19:04:30

#292# inches squared

Surface area of a rectangular prism: #2lw+2lh+2wh#

The cereal box is made of cardboard; therefore, the amount of cardboard used to make it is the surface area of the box.

Plug in 8, 2.5, and 12 for the length, width and height, respectively

#2*8*2.5+2*8*12+2*2.5*12#

#40+192+60#

#292 rarr# This is the surface area