The bottom of a cuboid is a square with a perimeter of 8dm, and its surface area is 20 square decimeters

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• 1. The perimeter of a square is 16 decimeters in 25. How many square decimeters is its area?
• 2. Use a 15 cm long, 12 cm wide rectangular paper to cut the largest square. What is the area of the cut part?
• 3. A piece of rectangular paper is 36 cm long and 20 cm wide. Fold the paper into the largest square. What is the square area?
• 4. There is a rectangular paper 20 cm long and 15 cm wide. Cut the largest square. What is the area of the square
• 5. Use a piece of rectangular paper 15 cm long and 7 cm wide to cut out the largest square. What is the area of the largest square? How many square centimeters are left?
• 6. A square, length and width increased by 50 decimeters, area increased by 135 square meters, square area The bull man, help
• 7. If the side length of a square increases by 50 cm, the area will increase by 135 square meters. How many square meters is the original square area
• 8. Cut a piece of paper with an area of 8 square decimeters into the largest circle. What's the area of this circle?
• 9. The area of a square is 16 square decimeters. How many square decimeters is the square area now?
• 10. Use a piece of square paper with a side length of 2 decimeters to form an empty cylinder. The circumference of the bottom surface of the cylinder is______ Decimeter, height is______ Decimeter, side area is______ Square decimeter
• 11. The perimeter of a square is 2.4 decimeters, and its area is () square meters
• 12. The area of a rectangular land is 36 square meters, its width is 40 decimeters, how many decimeters is the length of this land?
• 13. If the length of a rectangular cloth is reduced by 6 decimeters or the width by 4 decimeters, the area will be reduced by 36 square decimeters. What is the original area of this cloth
• 14. Cube edge length and 48dm cube surface area is a few square decimeters, a cube carton surface area is 5.1 square decimeters, it covers an area of several square decimeters
• 15. How many square meters of cardboard do you need to make 20 small cube cartons with 130cm edge length
• 16. How many square meters of hard paper do you need to make a small cube carton with 20 edges and 15 cm in length
• 17. How many cubes can a square carton with one meter edge length hold at most
• 18. How many cube cartons can be packed in a cube carton with one meter edge length at most (excluding carton thickness)
• 19. A 60 cm long wire is welded into a cube model. What is the surface area and volume of the cube? A school uses lime to paint the four walls and ceiling of the classroom. The room is 8 meters long, 6 meters wide and 4 meters high, deducting 15 square meters of doors and windows. If 0.25 kg of lime is used per square meter, how many kg of lime do you share? I'll see you later, little sister!
• 20. There is a 150cm long iron wire. After welding the wire into a cube, there is 6cm iron wire left. What is the surface area and volume of the cube? 2. When two cubes are used to make a cuboid, the sum of edge lengths is reduced by 32dm, and how much is the surface area reduced? 3. A cuboid is cut into two identical cubes, and the sum of the edges is increased by 24cm?