Xiaolan cut the largest circle from a square with a side length of 4cm. The circumference of the circle is () cm, and the remaining area is () cm We need the formula!

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• 1. The figure is a circle with a square inside. It is known that the area of the square is 64 square centimeters. How to find the area of the circle
• 2. How to get the smallest surface area with 12 cubes with 1cm side length?
• 3. The length, width and height of a cuboid are integers, and its volume is exactly 2006cm3. Now, after painting its surface area with red, it is cut into small cubes with side length of 1cm. If there are 178 small cubes with red three sides, there are 178 small cubes with red two sides______ One
• 4. If the height of a cuboid is reduced by 2 cm, it will become a cube, and the surface area will be reduced by 24 square cm. How about the volume of the original cuboid?
• 5. If the height of a cuboid is reduced by 2 cm to become a cube, the surface area will be reduced by 48 square cm, and the volume of the cube is () cubic cm A. 216B. 96C. 288D. 72
• 6. If the height of a cuboid is reduced by 2 cm, it becomes a cube and its surface area is reduced by 48 square cm
• 7. If the height of a cuboid is reduced by 2 cm to become a cube, the surface area will be reduced by 48 square cm, and the volume of the cube is () cubic cm A. 216B. 96C. 288D. 72
• 8. If the height of a cuboid is reduced by 2 cm to become a cube, the surface area will be reduced by 48 square cm, and the volume of the cube is () cubic cm A. 216B. 96C. 288D. 72
• 9. The surface area of a cuboid is 810 square centimeters. It can be cut into two identical cubes. What's the volume of this cuboid?
• 10. If you increase the height of a cuboid by 3cm, it will become a cube. The surface area of the cuboid is increased by 60cm. The surface area and volume of the cuboid can be calculated
• 11. Cut a circle with a diameter of 1.6cm into the largest square. What is the square area?
• 12. Xiaolan cut a round piece of paper with an area of 9.42 square centimeters. Can you guess that she should at least prepare () flat
• 13. For a cube, the side length increases by 30%, and the area increases by what percentage?
• 14. If a small cube with side length of 1 is dug out from a vertex of a cube with side length of 10, the surface area of the remaining figure is______ ．
• 15. When the side length of a cube increases by 20%, what percentage of its area increases?
• 16. If you dig a hole in a cube with a side length of 10 cm on the surface of a cube with a side length of 20 cm, how much has the surface area of a large cube increased?
• 17. Place the square aluminum block with a weight of 27 N and a side length of 10 cm in the center of the horizontal desktop with an area of 0.5 square meters (1) What is the pressure on the table (2) Now put an object with a mass of 1kg on the aluminum block. What is the pressure of the aluminum block on the table? (g takes 10N / kg) The kxxx train from Hangzhou to Meilong, Shanghai runs 168 km. The timetable of the train is as follows: Train time: Meilong, Linping, Hangzhou Arrival time of kxxx - 7:28 8:59 Driving time 7:10 7:30—— It can be seen from the table that what is the total running time and average speed of kxxx train?
• 18. When the side length of a square is increased by 6 cm, the area is increased by 114 square cm. How many cm is the original side length of a square?
• 19. Place the square aluminum block with weight of 27 N and side length of 10 cm in the center of the horizontal table with an area of 0.5 m square (1) How much pressure does the desktop receive? (2) Now put a 1kg block on top of the aluminum block. What is the pressure of the aluminum block on the table? (g = 10N / kg)
• 20. A cube with a side length of 10 cm and a weight of 100 N is placed in the center of a horizontal desktop with an area of 1 m ^ 2, and the cube is opposite to the desktop