OG详解-OG5 数学2 Q14

The correct answer is 4,205. The exterior surface area of a figure is the sum of the areas of all its faces. It’s given that the box does not have a lid and that each side of the box is in the shape of a square. Therefore, the box consists of 5 congruent square faces. It’s also given that the length of each edge is 29 inches. Let s represent the length of an edge of a square. It follows that the area of a square is equal to s². Therefore, the area of each of the 5 square faces is equal to 29² , or 841, square inches. Since the box consists of 5 congruent square faces, it follows that the sum of the areas of all its faces, or the exterior surface area of this box without a lid, is 5(841), or 4,205, square inches.