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1999 Calculus #10: Inscribing and Circumscribing to Infinity

Source:

June 21, 2012
calculusgeometrycircumcircle

Problem Statement

Let AnA_n be the area outside a regular nn-gon of side length 11 but inside its circumscribed circle, let BnB_n be the area inside the nn-gon but outside its inscribed circle. Find the limit as nn tends to infinity of AnBn\dfrac{A_n}{B_n}.