The diameter of circle a is 4 cm, and that of circle B is 6 cm. The area ratio of circle a and circle B is () a, 2:3 B, 8:12 C and 4:9

Choose C

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1. The area ratio of the two circles AB is 4:25, the radius difference is 6cm, and the area of circle a is () square centimeter?
2. 1. The sum of the radii of the two circles is 12 cm. The diameter of one circle is 10 cm. What is the area of the other circle in square cm? The sum of the radii of the two circles is 12 cm. The diameter of one circle is 10 cm. What is the area of the other circle? A flower bed is 5 meters, around it there is a 1 meter wide circular pebble path. How many square meters is the area of the path? Draw the largest semicircle in a square with a length of 6 decimeters and a width of 4 decimeters. How many decimeters is the circumference of the semicircle?
3. If the diameter of one circle is equal to the radius of the other, what is the relationship between the areas of the two circles?
4. Find the area of the circle below. R = 5cm, d = 6dm, C = 15.7m
5. When the radius of a circle increases from 6 cm to 9 cm, the area of the circle increases ()
6. The radius of the circle increased by 6cm from 3cm, and the area of the circle increased by () square centimeter A. 27πB. 36πC. 72πD. 9π
7. There is a ring, the radius of the inner circle is 6cm, the radius of the outer circle is 10cm, what is the area of the outer circle
8. The radius of a circle is 15.84 cm longer than its circumference. What is the area of the circle in square centimeters?
9. The radius of a circle is 15.84 cm longer than its circumference. What is the diameter of the circle? Answer the solution, another solution, 50 for the respondent Make a formula
10. The radius of a circle is 15.84 cm shorter than its circumference. What is the diameter of the circle?
11. Excuse me: how to find out the area of a semicircle with a diameter of 8 cm
12. The area of a circle 8 cm in diameter is equal to the sum of the areas of two circles 4 cm in diameter______ ．
13. If the radius of a circle is reduced by 1 / 3, its area will be reduced by 25 square decimeters
14. If the radius of the circle is increased by 15, its area will be increased by 88 DM2
15. If the radius of a circle increases by 1 / 5, its area will increase by 88 square decimeters Very urgent! There is a prize for correct answer Double reward for the right person
16. If the area of a circle is 2 π cm square, find the radius of the circle
17. The sum of the areas of two circles with a diameter of 10 cm is equal to that of a circle with a diameter of 20 cm______ ．
18. The sum of the radii of two circles is 12 cm. The diameter of one circle is 10 cm. What is the area of the other circle?
19. The diameter of a circle increases by 10%, and the area of the circle increases by ()%
20. If the diameter of a circle is increased by 1 / 10, how many parts of the area of the circle will be increased