It is known that the length of a rectangle is 20cm and the width is 5cm. The area of a rectangle is converted into a square and the perimeter of the square is calculated

C＝4√﹙20×5﹚＝40 ﹙cm﹚

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1. : find out the perimeter and area of the figure below! The top is a semicircle, the bottom is a rectangle, the length of the rectangle is 4cm, the width is 5cm Figure out the perimeter and area of the figure below! Above is a semicircle, below is a rectangle, the length of the rectangle is 4cm, the width is 5cm
2. A 20 cm long, 15 cm wide rectangular cardboard, four corners cut side length of 5 cm, do not cover the box, no cover how big cardboard box, can hold how much juice
3. As shown in the picture: a rectangular sheet of iron, 30cm long and 20cm wide, subtracting a small square with 4cm side length from four corners, and then folding it along the dotted line to make a box without a cover. How many milliliters is the volume of the box? How much sheet iron is actually used to make the box? (I have no picture, understanding)
4. There is a piece of paper with a length of 6.5cm and a width of 2cm, as shown in the figure. Please divide it into 6 pieces, and then put it together into a square. (requirement: draw the dividing line in the figure, and then draw the square and mark the corresponding data)
5. The length of the oblique side of a right triangle is 20cm, and the two right sides are respectively suspended 16cm and 12cm. What is the height of the oblique side
6. How many centimeters is the circumference of the rectangle? I know the answer is 140, but I don't know how to get it
7. Square and circle with equal circumference, which is big? Please explain why! (I know it's a circle, just want to know why.)
8. There is a square. If the side length is reduced by 5 cm, the area will be reduced by 125 square cm There is a square. If the side length is reduced by 5 cm, the area will be reduced by 125 square cm. How about the square area?
9. The length of a rectangle is x meters and the width is y meters. If the width remains the same and the length decreases by 3 meters, then its perimeter decreases by () meters and its area decreases by () square meters
10. Put two rectangles 8 cm long and 4 cm wide into a square. What's the perimeter of the square and what's the perimeter of a large rectangle?
11. Excuse me: a circle with a radius of 2.5cm is equal to the perimeter of a rectangle. It is known that the length of the rectangle is 4.5cm. What is the area of the rectangle?
12. A rectangle is 8cm long and 5cm wide. What are its area and perimeter?
13. A rectangle with a square bottom area, the perimeter of the bottom area is 12cm, 5cm, the bottom area of the rectangle is (), the surface area is ()
14. If a = 5cm, find the perimeter and area of the square; if a = 7cm, B = 4cm, find the perimeter and area of the rectangle
15. The instrument station needs to make a rectangular wooden box with a volume of 672 cubic decimeters. If the length of the wooden box is 1.4 meters and the width is 0.6 meters, what is the height of the wooden box
16. A cuboid wooden box with a cover, the volume is 0.576 cubic meters, its length is 12 decimeters, width is 8 decimeters, to make such a wooden box at least use wood how many square meters?
17. The perimeter of the bottom surface of a rectangular wooden box is 16 decimeters, and the surface area is 78 square decimeters
18. There is a cuboid with a surface area of 184 square centimeters, a bottom area of 20 square centimeters, and a bottom perimeter of 18 centimeters. The cuboid has a volume of______ Cubic centimeter
19. The surface area of a cuboid is 184cm2, the bottom area is 20cm2, and the perimeter of the bottom surface is 18cm. What is the volume of this cuboid? The surface area of a cuboid is 184cm2, the bottom area is 20cm2, and the perimeter of the bottom surface is 18cm. What is the volume of this cuboid?
20. A rectangular glass water tank with a length of 40cm, a width of 20cm and a height of 30cm (measured from the inside) has a water depth of 18cm Come on, don't use equations