The length of a machine part is 5 mm, and the cost on the drawing is 4 cm

4cm: 5mm = 40:5 = 8:1

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1. 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
2. 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
3. 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
4. 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?
5. 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
6. 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
7. 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?
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