The area of a circular ring is 2464cm². If the inner radius of the ring is 21 m, find its outer radius.
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Circumference of circle: The distance around the circular region is called its ... between two concentric circles of different radii is called the area of the ring. ... A race track is in the form of a ring whose inner circumference is 220 m and outer circumference is 308 m. ... Find the area of the circle if its circumference is 132 cm.
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