A rectangle 4 cm long and 2 cm wide is enlarged by 3:1, and the area of the figure is______ ．

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• 1. The perimeter of a square is 48 cm. How many cm is its side? How many cm is its area
• 2. The side length of a square is increased by 2 decimeters, and the area is increased by 48 square decimeters? There are no unknowns involved!
• 3. (1) There is a square with a total edge length of 48 cm. Its surface area is () square cm and its volume is () square cm (2) There is a cuboid that intersects at a vertex and three edges are 5 decimeters, 4 decimeters and 3 decimeters long respectively. The total edge length of the cuboid is () decimeters, the surface area is () square decimeters, and the volume is () cubic decimeters
• 4. On a drawing with a scale of 1:5000, draw a square lawn with a side length of 4cm. The actual side length () actual area ()
• 5. A square lawn with side length of 2 cm is drawn on the drawing with scale of 1:5000. The actual area of this lawn is () square meters 1. A square lawn with side length of 2 cm is drawn on the drawing with scale of 1:5000. The actual area of this lawn is () square meters 2. A section of cylindrical steel is cut into a largest cone, and the weight of the cut part is 16KG. This section of cylindrical steel weighs () kg 3. The number of a is 40% of the number of B (the number of a is greater than the number of B), the number of a is less than the number of B ()% 3. Number a is 40% of number B (number a is greater than number b), number a is not equal to number B, number a is less than number B ()% The last question is wrong. Please look at it clearly!
• 6. On the drawing with a scale of 1:500, the side length of a square flowerbed is 4cm. How many square meters is the actual area of the flowerbed? Why is the actual area: 20 * 20 = 400 square meters instead of side length * 4, that is, 20 * 4 = 80
• 7. The scale of a picture is 1:5000. In this picture, the radius of a round flower bed is 0.6cm. The actual floor area of this flower bed is () square meters
• 8. How much is the area of a square flower bed with a side length of 10 meters? How much is the area when you draw it on a 1 / 200 scale drawing? What do you find through calculation
• 9. A triangle flowerbed scale is 1 / 300 on the drawing, measure the bottom 3 cm long, 4.4 cm high, calculate the actual area of the flowerbed
• 10. How many times of the square's area? It should be doubled, not doubled
• 11. 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)
• 12. Enlarge a rectangle 4 cm long and 2 cm wide by 4:1 to get the area of the figure?
• 13. What does it mean to enlarge the figure to a scale of 1:3?
• 14. A rectangle 5cm in length and 3cm in width, the area of the figure obtained by 4:1 magnification is______ cm2．
• 15. 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 ()
• 16. 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?
• 17. 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______ ．
• 18. 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
• 19. 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
• 20. 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