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A castle is at the center of the several flat paths which

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by M7MBA » Mon Apr 15, 2019 1:22 am
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A castle is at the center of the several flat paths which surround it: 4 straight paths that travel from the castle to its circular moat, where they meet up with a perfectly circular path which borders the moat; that circular path circumscribes a square path which has its corners at the ends of the 4 straight paths—see the diagram above. If the total length of all of the pathways is "q" kilometers, then which expression represents the distance from the castle to the circular moat?

A) q / 4(2+2*sqrt(2)+pi) km
B) q / 2(2+2*sqrt(2)+pi) km
C) q / (2+2*sqrt(2)+pi) km
D) 2q / (2+2*sqrt(2)+pi) km
E) 4q / (2+2*sqrt(2)+pi) km

[spoiler]OA=B[/spoiler]

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