A cube with a side length of 1 cm is placed in layers as shown in the figure. When it is overlapped to 5 layers, how many square centimeters is the surface area of the solid figure?

This problem should be solved in this way, because all small cubes are connected together, so directly calculate the projection of six faces, and the surface area of each face is the same, overlapping to five layers, the surface area of each face is 15 (1 + 2 + 3 + 4 + 5), six faces, 15x6 = 90, the answer is 90 square centimeters

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1. As shown in Figure 1, a rectangular bar runs from the left side of the square to the right side, and runs 2 cm per second. As shown in Figure 2, the total score relationship of the overlapping area with the square is shown. ① after running for 4 seconds, the overlapping area is______ What is the side length of a square______ (3) complete the diagram of overlapping area between square and square in Figure 2. (4) the maximum overlapping area is______ When a rectangle leaves a square, it uses______ Seconds
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