When the radius of a circle increases from 6 cm to 9 cm, the area of the circle increases ()

When the radius of a circle increases from 6cm to 9cm, the area of the circle increases (125%)

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1. 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
2. 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
3. The radius of a circle is 15.84 cm longer than its circumference. What is the area of the circle in square centimeters?
4. 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
5. The radius of a circle is 15.84 cm shorter than its circumference. What is the diameter of the circle?
6. The area of a circle is 10 square centimeters. If its radius is doubled, the area of the circle will be 10 square centimeters______ Square centimeter
7. For a circle with radius r, if the radius increases X and the area of the circle increases y, then the functional relationship between Y and X?
8. It is known that the area of a circle with radius RCM is the sum of the areas of two circles with radius 2cm and 3cm, and the value of R is obtained
9. It is known that the area of a big circle is the sum of the areas of two small circles. If the radius of the big circle is RCM and the radius of the two small circles are 2cm and 3cm respectively, the value of R is obtained
10. It is known that the area of a circle with radius RCM is equal to the sum of the areas of two circles with radius 2cm and 3cm=______ ．
11. Find the area of the circle below. R = 5cm, d = 6dm, C = 15.7m
12. 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?
13. 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?
14. 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?
15. 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
16. Excuse me: how to find out the area of a semicircle with a diameter of 8 cm
17. The area of a circle 8 cm in diameter is equal to the sum of the areas of two circles 4 cm in diameter______ ．
18. If the radius of a circle is reduced by 1 / 3, its area will be reduced by 25 square decimeters
19. If the radius of the circle is increased by 15, its area will be increased by 88 DM2
20. 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