The radius of an outer circle is 21cm and the inner circle is 14cm. Find the area of a circular
ring
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Let us given, radius of outer circle, R=14 cm & radius of inner circle, r=10.5 cm.
Areaofthecircularring=π(R 2 −r 2 )= 722
(14 2−10.5 2 )=270cm
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