A rectangle 5cm in length and 3cm in width, the area of the figure obtained by 4:1 magnification is______ cm2．

5 × 4 = 20 (CM), 3 × 4 = 12 (CM), 20 × 12 = 240 (square cm). Answer: the area of the figure is 240 square cm

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1. What does it mean to enlarge the figure to a scale of 1:3?
2. Enlarge a rectangle 4 cm long and 2 cm wide by 4:1 to get the area of the figure?
3. 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)
4. A rectangle 4 cm long and 2 cm wide is enlarged by 3:1, and the area of the figure is______ ．
5. The perimeter of a square is 48 cm. How many cm is its side? How many cm is its area
6. 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!
7. (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
8. 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 ()
9. 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!
10. 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
11. 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 ()
12. 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?
13. 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______ ．
14. 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
15. 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
16. 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
17. 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
18. 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
19. The circumference of a rectangle is 184cm, and its length is three times of its width. What is the area of a rectangle? emergency
20. The perimeter of a rectangle is 80cm, and the ratio of length to width is 5:3. What is the area of the rectangle?