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?
[the surface area]=2*[area of the base]+[perimeter of the base]*height [the surface area]=2*[8*2.5]+[2*(8+2.5)]*12 [the surface area]=40+252-----> 292 in²
the answer is the least amount of cardboard needed to make the cereal box is 292 in²
