Show that where r is the radius of the circle circumscribing the triangle PQR whose sides are

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Show that

sin C 2r sin B b sin A


where r is the radius of the circle circumscribing the triangle PQR whose sides are a, b, and c, as shown in the figure.

Draw thel diameter PP'. Then B = ∠PQR = ∠PP' R, and angle ∠PRP' = 90°.

a БP

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Precalculus

ISBN: 978-0321716835

9th edition

Authors: Michael Sullivan

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