Learn Problems on Rings and Semicircles in 3 minutes.
Let R and r denotes the radii of outer and inner circles respectively, then area of the circular ring is calculated using the formula:
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Find the area of a ring whose outer and inner radii are 19 cm and 16 cm respectively.A. $330\\text{ cm}^{2}$ B. $310\\text{ cm}^{2}$ C. $320\\text{ cm}^{2}$ D. $350\\text{ cm}^{2}$
5 Ways to Calculate the Area of a Circle - wikiHow
calculus - Find the area of an infinitesimal elliptical ring. - Mathematics Stack Exchange
