A cereal box has the dimensions shown. A drawing of a rectangular prism shaped cereal box with length 9 inches, width 4 inches and height 12 inches. a. Find the surface area of the cereal box.

surface area of the rectangular shaped cereal box = 384 ft²

Step-by-step explanation:

The cereal box is a rectangular prism. The rectangular prism has a length of 9 inches, height of 12 inches and width of 4 inches. The surface area can be computed below.

Surface area of the prism is the sum of the area of all the faces. Therefore,

surface area = 2wl + 2lh + 2hw

where

l = length

w = width

h = height

surface area = 2wl + 2lh + 2hw

l = 9 inches

w = 4 inches

h = 12 inches

surface area = 2 (4 * 9) + 2 (9 * 12) + 2 (12 * 4)

surface area = 2 (36) + 2 (108) + 2 (48)

surface area = 72 + 216 + 96

surface area of the rectangular shaped cereal box = 384 ft²