How to make a big square with two squares of equal area and side length

It's simple,

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1. There is a figure, the upper left corner is a small square, the big square in the lower left corner of the small square, known as two squares There is a figure, the upper left corner is a small square, and the large square is in the lower left corner of the small square. It is known that the area of the overlapping part of the two squares is equal to 1 / 9 of the area of the large square and 1 / 4 of the area of the small square. The ratio of the area of the large square to the area of the small square is calculated
2. The edge length of the large cube is twice that of the small cube, and the volume of the large cube is 21 cubic decimeters more than that of the small cube. What is the volume of the small cube?
3. The Ling length of a large square is twice that of a small square. The volume of a large square is 35 cubic centimeters more than that of a small square. What is the volume of a small cube
4. Put two rectangles 18 cm in length and 8 cm in width together to form a large rectangle. The area of the large rectangle is {} square centimeter and the perimeter is {} centigrade
5. The circumference of a rectangle is 18 cm, and its length and width are in whole centimetres. What is the area of the rectangle? Please write down
6. For a rectangle, the ratio of length to width is 14:5. If the length is reduced by 13 cm, the width is increased by 13 cm, and the area is increased by 18 square cm, the area of the original rectangle can be calculated
7. If the length of a rectangle is reduced by 5 cm, the area will be reduced by 40 square cm. The rest is just a square. The area of the original rectangle is 40 square cm______ Square centimeter
8. When the length of a rectangle is removed by 5cm, the area will be reduced by 40cm, and the remaining part is just a square. How many square centimeters is the area of the original rectangle
9. If the length of a rectangle is reduced by 5 cm, the area of the rectangle will be reduced by 40 square cm, and the rest is just a square, which is the same as the original rectangle
10. For a rectangle, its length is reduced by 5cm, or its width is reduced by 4cm, and its area is reduced by 40 square centimeters. What is the area of this rectangle
11. The circumference of a rectangle is between 401cm and 50cm. The ratio of its length to width is 5:7. What is the area of the rectangle?
12. There are two rectangles of the same size, 36 cm in length and 18 cm in width. What is the circumference of a square?
13. There are two rectangles of the same size, 36 cm in length and 18 cm in width. (1) what is the circumference of a square? There are two rectangles of the same size, 36 cm long and 18 cm wide (1) What is the circumference of a square? (2) What is the circumference of a rectangle? (3) Is the area of the two figures equal? What is the area? How to make a formula?
14. The perimeter is 36cm square and rectangle, the width of the rectangle is 20% of the length, the area of the rectangle is the square area? Formula OK, add 30
15. The perimeter of a rectangle is 50 meters, and the ratio of length to width is 3:2. The area of the rectangle is______ Square meters
16. The length and width of a rectangle are prime numbers, and the perimeter is 36cm. What is the maximum area of a rectangle?
17. (fifth grade mathematics) the length and width of a rectangle are prime numbers, and the perimeter is 36cm. What is the largest area of a rectangle? Please explain in detail: What is prime? What is composite?
18. The length and width of a rectangle are prime numbers, and the perimeter is 36cm. What is the maximum area of the rectangle?
19. A rectangle with a circumference of 120 cm has a length to width ratio of 7:5. What's the area of the rectangle?
20. There is a rectangle. The ratio of length to width is 7:5. It is known that the circumference of the rectangle is 48CM. What is the area of the rectangle?