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

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• 1. 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 ()
• 2. 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
• 3. 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 ()
• 4. 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
• 5. 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
• 6. 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
• 7. Area 18.84 the area of a circle is 18.84. Find the radius, diameter and perimeter
• 8. 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
• 9. 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
• 10. The area of a circle is 78.5cm-178. How to calculate the diameter, radius and perimeter of a circle
• 11. 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
• 12. A circle, 5cm in diameter, how many cm in radius
• 13. A garden with a radius of 3.5cm, what is its diameter, perimeter and area?
• 14. 1、 The radius of a circle is 5cm, its perimeter is () cm, and its area is () cm2
• 15. The radius of a circle is 5cm and the diameter is 5cm___ Cm, circumference is___ Cm, the area is___ cm2．
• 16. When the radius of a circle increases from 3cm to 5cm, the circumference increases by () cm
• 17. 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?
• 18. The area of a circle is 12.56 square centimeters. There is a square in the circle. Find the square area
• 19. 1. Cut out the largest circle in a square with a side length of 4 cm. The area of the circle is (12.56) square cm 2. The diameter of the outer circle is 8 decimeters, the radius of the inner circle is 2 decimeters, and the area of this circle is () square decimeters 3. The radius of a semicircle is 6 decimeters, and its circumference is (37.68) decimeters 4. A circle with a circumference of 28.26 meters, if its diameter expands to three times of the original, its area expands to () times
• 20. Cut the largest circle on a square iron sheet 12 cm long on one side, and the area to be cut is______ Square centimeter