Three-dimensional body exercises in junior high school mathematics life
A cube with a side length of 4cm, and a cube with a side length of 1cm is dug in the middle. Q: How many square centimeters is the surface area of the cutting pattern? The original surface area is s=4*4*6=96, because a cube is dug up, down, front, back, left and right, and the surface area of each cube is 4 (any small cube has no upper surface, but the lower surface has been calculated, and only four sides have been added), so the increased surface area is 4*6=24, and the middle one is because it is in a big cube. Therefore, the surface area of the unearthed figure is 96+24= 120.