The picture is made up of four identical small squares, each of which is 100 square centimeters. You can draw a square with an area of 80 square centimeters in the picture (1) The picture on the right below is made up of four identical small squares. The area of each small square is 100 square centimeters. Now please draw a square with an area of 80 square centimeters in the picture and explain your method with pictures or words

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• 1. It's a figure made up of four squares with an area of 100 square centimeters. Can you draw a square with an area of 80 square centimeters? chart
• 2. The area of a rectangle is 100 square centimeters. If the length is reduced by four times and the width is increased by four times, the rectangle will become a square, and the area of the square
• 3. The area of a trapezoid is 8 square centimeters. If its upper bottom, lower bottom and height are doubled, how many square centimeters is its area
• 4. In a trapezoid, there are two triangles with an area of 6cm2 and 8cm2 respectively (as shown in the figure). If the length of the bottom of the trapezoid is twice that of the top, the area of the shadow part in the figure is______ ．
• 5. The top bottom of a trapezoid is 4cm, the bottom is 6cm, and the height is 5cm. If you enlarge it by 5:1, what is the area of the enlarged figure in square centimeter?
• 6. The top of a trapezoid is a centimeter, the bottom is B centimeter, and the height is h centimeter. Its area is () square centimeter. If a = B, then the figure becomes（ Shape, area (). If a = 0, then the shape becomes () shape, area ()
• 7. A rectangle 5cm in length and 3cm in width, the area of the figure obtained by 4:1 magnification is______ cm2．
• 8. What does it mean to enlarge the figure to a scale of 1:3?
• 9. Enlarge a rectangle 4 cm long and 2 cm wide by 4:1 to get the area of the figure?
• 10. Enlarge a rectangle of 6cm in length and 4cm in width by 2:1, and the area of the figure is 48cm3______ (judge right or wrong)
• 11. The area of a square is 100 square centimeter. If you enlarge it by a ratio of 10:1, what is its area? How to calculate it
• 12. The circumference of a rectangle is 184cm, and its length is three times of its width. What is the area of a rectangle? emergency
• 13. The perimeter of a rectangle is 80cm, and the ratio of length to width is 5:3. What is the area of the rectangle?
• 14. A rectangle has a circumference of 240 meters and a length of 1.5 times the width. What is the area of the rectangle?
• 15. The perimeter of a rectangle is 24 meters, its ratio of length to width is 7:5, and its area is () square meters A. 35B. 240C. 140
• 16. The perimeter of a rectangle is 24cm, the ratio of length to width is 5:3, and the area of a rectangle is () square meters?
• 17. Use the equation to solve: the circumference of a rectangle is 120 meters, and the length is 1.5 times of the width. How many square meters is the area of the rectangle?
• 18. The circumference of a rectangle is 30cm, in which the length is twice the width. What is the length and width of the rectangle?
• 19. Xinhua Bookstore delivered a batch of children's books, which sold 1800 in the first day, 19 more in the second day than in the first day, and the remaining 37 sold out in the third day?
• 20. The ratio of a and B is 5:2, a is 35, B is () On the map of scale 1:2000, the line segment of 7cm on the map represents the actual distance () M There is a kind of salt water, the ratio of salt and water is 1:10. How many kilograms of water is needed to make this salt water with 5.5 kilograms of salt The school uses the same square brick to pave the floor. It needs 120 square bricks to pave 5 square meters. According to this calculation, how many square bricks do you need to use to pave 32 square meters? (to be listed)