The radius of the outer circle of a ring is 5cm longer than that of the inner circle, and the radius of the inner circle is 3cm. What is the area of the ring?
π(8^2-3^2)=55π
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- 1. A circular ring, the diameter of the outer circle is 5cm, the radius of the inner circle is 3cm, how many square meters is its area?
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- 14. The diameter of the small circle is 5cm, the radius of the big circle is 5cm, the perimeter ratio of the big circle and the small circle is (), and the area ratio is () Write down the formula
- 15. The radius of a small circle is 3cm, the radius of a large circle is 4.5cm. What is the simplest integer ratio of the circumference of a small circle to a large circle
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- 19. The radius of a circle is equal to the side length of a square. The area of a square is 3 square decimeters. The area of this circle is 3 square decimeters
- 20. The side length of a square is equal to the radius of a circle, and the area of a square is 5 square decimeters (hint: a = R, the square of a = R, the square of a)