Area of Annulus (Circular Ring) — Two Formulas, Perimeter, Width, Example - YouTube
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. $350\\text{ cm}^{2}$
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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