A cube gift box, edge length 6cm, how many square centimeters of wrapping paper should be used to wrap the gift box at least?

6 × 6 × 6 = 216 (square centimeter); a: this gift box should be packed with at least 216 square centimeter wrapping paper

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1. Xiao Li wants to put a small gift that is 18cm long, 15cm wide and 12cm high into a packaging box that is 20cm long, 16cm wide and 3.2 cubic decimeters in volume, Can you fit it?
2. A rectangular column is poured in a construction site. It uses 30 meters of concrete. The column is 20 meters high and the bottom is a square. Please estimate the side length of the square on the bottom? (accurate to 0.1 meters)
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4. There is a concrete square column in the city gymnasium, which is 4 meters long and the bottom is a square with a side length of 3 decimeters. If the square column is pasted with ceramic tiles, what is the area of the tile part? How many cubic meters of concrete does this square column need?
5. A cuboid column, 4.5 meters high, with a side length of 0.6 meters square at the bottom. To paste tiles around the column, the tile specification is a side length of 0.6 meters square, how many tiles do you need?
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