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The length of $ED$ is 1124 units so the length of $DC$ is $R  1124$ units. The triangle $BCD$ is a right triangle and hence \[ \tan(15^o) = \frac{BD}{DC} = \frac{200}{R1124}.\] Thus \[R  1124 = \frac{200}{\tan(15^o} = \frac{200}{0.2679} = 746.4.\] Hence \[R = 1124 + 746.4 = 1870.4 \mbox{ units.}\] Penny 



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