The actual length of a machine part is 1 mm, and it is 2 cm on the drawing. What is the scale of this drawing

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• 1. As shown in the figure, the shadow is 2 / 5 of the area of the big circle and 1 / 3 of the area of the small circle. What is the ratio of the area of the big circle to the area of the small circle
• 2. The area ratio of the shadow part to the blank part of the big circle is 1:6, and the area ratio of the shadow part to the blank part of the small circle is 2:5 The area ratio of the shadow part to the blank part of the big circle is 1:6, and the area ratio of the shadow part to the blank part of the small circle is 2: given that the radius of the big circle is 10 cm, what is the area of the small circle?
• 3. As shown in the figure, the radius of the small circle is 4dm, and the shadow part accounts for 1 / 5 of the area of the small circle and 1 / 8 of the area of the large circle. How many square decimeters is the area of the large circle
• 4. The area of the shadow is 3 square decimeters, which is 1 / 8 of the area of the big circle and 1 / 5 of the area of the small circle It's better to write down the meaning of each step formula. Whoever writes it is the best answer
• 5. There are two circles, big and small. The area difference between them is 62.8 square decimeters, and the radius of the big circle is 1.5 times that of the small circle. Then, what are the areas of the two circles?
• 6. There are two circles, big and small. The area difference between them is 62.8 square decimeters, and the radius of the big circle is 1.5 times that of the small circle. What are the areas of the two circles? know Big circle radius: small circle radius = 1.5:1 = 3:2 How to find the area?
• 7. Known shadow area is 20 square decimeters, ring area
• 8. As shown in the figure, the area of the shadow part is 18% of the area of the big circle and 38% of the area of the small circle. If the area of the shadow part is 15 square centimeters, find the total area of this figure
• 9. As shown in the figure, the area of the shadow part is 18% of the area of the big circle and 38% of the area of the small circle. If the area of the shadow part is 15 square centimeters, find the total area of this figure
• 10. As shown in the figure, the shadow part accounts for 1 / 5 of the area of the big circle and 3 / 7 of the area of the small circle. Q: the ratio of the area of the big circle to the area of the small circle
• 11. As shown in the figure is a cross section of a machine part drawn on a scale of 1:20. Please measure the radii of the two circles in the figure and calculate the actual cross section area of the part
• 12. The length of a machine part is 5 mm, and the cost on the drawing is 4 cm
• 13. The right figure below is a cross-section of a machine part drawn on a scale of 1:20. What is the actual area of the cross-section? Matter cm
• 14. Why does water change into ice and the quality remains the same Please say why it doesn't change. Please explain in detail. Thank you
• 15. Is the function y = xcosx infinite when x → + ∞? Why?
• 16. Ask some English words Have a good time 2 be interested in doing sth 3 sightseeing 4 haircut 5 because And the famous 6 is good at 7 on the east coast 8 uses a lot of his language 9 decides to do something
• 17. Finding the domain of definition of X under the quadratic root of y = sin
• 18. How to remember the Chinese meaning of English words?
• 19. I like your cooking?
• 20. The students go to the park to row boats. There are 60 people in total. They hire 16 boats. The big boat takes 4 people and the small boat takes 2 people. Each boat is full? Hypothesis method, equation method, list method and foot lifting method are all OK,