The radius of the big circle is 6cm, the radius of the small circle is 2cm. The perimeter ratio of the big circle to the small circle is (), and the area ratio of the small circle to the large circle is ()

The radius of the big circle is 6cm, the radius of the small circle is 2cm. The perimeter ratio of the big circle to the small circle is (3:1), and the area ratio of the small circle to the big circle is (1:9)

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1. The perimeter difference between the two circles is 94.2cm, and the radius of the big circle is twice the diameter of the small circle
2. The perimeter difference of two circles is 94.2cm. The radius of the big circle is twice the diameter of the small circle. The sum of the areas of the two circles is calculated
3. The sum of radius, diameter and perimeter of a circle is 18.56cm. How many square centimeters are left after one fourth of the area of the circle is removed? 30 points is the formula
4. Area 18.84 the area of a circle is 18.84. Find the radius, diameter and perimeter
5. The area ratio of the two circles is 9:1. The perimeter difference is 12.56 cm. The area difference between the two circles is () square cm
6. The sum of the area of a and B circles is 680 square centimeters. The radius ratio of a and B circles is 5:3. What is the area of a square centimeter and that of b square percent The sum of the two circles is 680 square centimeters. The radius ratio of a and B is 5:3. What's the area of a and B
7. The area of a circle is 78.5cm-178. How to calculate the diameter, radius and perimeter of a circle
8. A circle with an area of 314 square decimeters has a radius of______ Decimeter, circumference is______ Decimeter
9. The area of a circle is 314 square centimeters, the circumference is (), the radius is (), and the diameter is () Why? How
10. What is the carrying capacity of freight cars multiplied by the number of freight cars needed
11. The radius of the big circle is twice that of the small circle, the circumference of the big circle is 25.12cm, and the circumference of the small circle is () cm
12. The radius of small circle is 5cm, the radius of big circle is 7cm, the ratio of circumference of small circle to big circle is (), the ratio of area is ()
13. The radius of the big circle is 5cm, the radius of the small circle is 2cm, and the perimeter ratio of the big circle and the small circle is 5cm
14. The radius of the big circle is 12cm, the radius of the small circle is 5cm, and the circumference of the big circle is? Times that of the small circle
15. A circle, 5cm in diameter, how many cm in radius
16. A garden with a radius of 3.5cm, what is its diameter, perimeter and area?
17. 1、 The radius of a circle is 5cm, its perimeter is () cm, and its area is () cm2
18. The radius of a circle is 5cm and the diameter is 5cm___ Cm, circumference is___ Cm, the area is___ cm2．
19. When the radius of a circle increases from 3cm to 5cm, the circumference increases by () cm
20. There are two circles. The area of the big circle is 9 times that of the small circle. The circumference of the big circle is 12.56 cm more than that of the small circle. How many cm are the circumference of the big circle and the small circle? There are two circles. The area of the big circle is 9 times that of the small circle. The circumference of the big circle is 12.56 cm more than that of the small circle. How many cm are the circumference of the big circle and the small circle?