There are two squares with side length of 20 cm, one of which has a vertex in the center of the other. What is the area of the overlapping part of the two squares

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• 1. A square piece of paper with side length of 20 cm is cut down from the top 5 cm along the 45 ° angle to form a small square in the middle to calculate the area of the small square
• 2. If the side length is reduced by 2 cm, then the area is reduced by 28 square cm. How much is the area of the original square Can there be a formula that they can understand
• 3. A piece of iron wire can be folded into a rectangle of 30cm and 20cm in width. If the iron wire is folded into a square, what is the side length and area of the square?
• 4. There is a rectangular sheet of iron 30 cm long and 20 cm wide, which is cut from each of the four corners with a side length of 5 cm to make an open iron box. What is the surface area of the box? I want the formula
• 5. As shown in the right figure, the area of the shadow part in the quadrilateral accounts for 16% of the area of the circle and 15% of the area of the quadrilateral; the area of the shadow part in the triangle accounts for 19% of the area of the triangle and 18% of the area of the circle______ ．
• 6. In the figure, it is known that the area of the blank part in the parallelogram is 77 square centimeters, and the area of the shadow part is 16 wide and 7 high
• 7. The lengths of two sides of an isosceles triangle are 4cm and 6cm, respectively
• 8. An isosceles triangle is 6cm long on one side and 4cm long on the other side
• 9. If the lengths of two sides of an isosceles triangle are 3cm and 4cm respectively, what are the lengths of the other side and the circumference of the isosceles triangle
• 10. If both sides of an isosceles triangle are 3cm and 7cm in length, then its circumference is______  cm．
• 11. A piece of square paper with a side length of 20 cm is cut at a 45 degree angle 5 cm from the top (as shown in Figure 5), and a small square is formed in the middle. What is the area of the small square?
• 12. A piece of square paper with a side length of 20 cm is cut at a 45 degree angle 5 cm from the top (as shown in Figure 5), and a small square is formed in the middle. What is the area of the small square?
• 13. A circle has the largest square in it. The diameter of the circle is 20 cm. Find the area of the square
• 14. When the height of a cuboid is reduced by 2cm, it becomes a cube, and the surface area is reduced by 48cm2. What is the volume of the original cuboid?
• 15. If the height of a cuboid is increased by 2cm, it will become a cube. The surface area will be increased by 64cm. What is the volume of the cuboid?
• 16. When the height of a cuboid increases by 2cm, it becomes a cube. At this time, the surface area increases by 56 square centimeters. What is the volume of the original cuboid? Attach the formula and explanation
• 17. 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
• 18. If the height of a cuboid is increased by 2cm, it will become a cube. The surface area of the cuboid will be increased by 56cm. The volume of the cuboid is
• 19. If the height of a cuboid is reduced by 4 cm, it will become a cube. At this time, the surface area will be reduced by 96 square cm. What is the volume of the original cuboid?
• 20. If the height of a cuboid is increased by 3cm, it will become a cube, and the surface area will be increased by 60cm______ Cubic centimeter