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One on octagon

Source: Indian RMO 1992 Problem 9

October 15, 2005
geometrycircumcirclesymmetrytrigonometrytrig identitiesLaw of Cosines

Problem Statement

The cyclic octagon ABCDEFGHABCDEFGH has sides a,a,a,a,b,b,b,ba,a,a,a,b,b,b,b respectively. Find the radius of the circle that circumscribes ABCDEFGH.ABCDEFGH.
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