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(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?
Composite number refers to the number that can be divided by other numbers except 1 and itself. For example, 4,6,8,9,10 prime number is also called prime number. It refers to the number that can not be divided by other natural numbers except 1 and itself in a natural number greater than 1. For example, 2,3,5,7,11132 * (a + B) = 36, that is, a + B = 18
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- 1. The length and width of a rectangle are prime numbers, and the perimeter is 36cm. What is the maximum area of a rectangle?
- 2. 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
- 3. 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
- 4. 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?
- 5. There are two rectangles of the same size, 36 cm in length and 18 cm in width. What is the circumference of a square?
- 6. 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?
- 7. How to make a big square with two squares of equal area and side length
- 8. 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
- 9. 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?
- 10. 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
- 11. The length and width of a rectangle are prime numbers, and the perimeter is 36cm. What is the maximum area of the rectangle?
- 12. A rectangle with a circumference of 120 cm has a length to width ratio of 7:5. What's the area of the rectangle?
- 13. 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?
- 14. A rectangle, its perimeter is 36cm, the ratio of length to width is 7:2, the area of the rectangle is______ Square centimeter
- 15. It is known that the side length of a large square is 4cm longer than that of a small square, and the area of a large square is 96cm2 larger than that of a small square
- 16. As shown in the figure below, there is a largest circle in the big square, and there is a largest square in the circle. Calculate the area ratio of the largest square to the small square emergency
- 17. If the length and width of a rectangle are all integral centimeters, and the area of the rectangle is 24 square centimeters, what is the perimeter of the rectangle?
- 18. If the length and width of a rectangle are all integral centimeters, and the area of the rectangle is 24 square centimeters, what is the perimeter of the rectangle?
- 19. It is known that the circumference of a rectangle is 24 cm, and one side is a cm
- 20. The perimeter of a square is C cm, its side length is () cm, and its area is () square cm. When C = 24, its area is () square cm