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Mathematics 92 Online
OpenStudy (anonymous):

The number of rectangles that can be obtained by joining four of the 11 vertices of a 11-sided regular polygon is _________.

OpenStudy (anonymous):

Zero, of course! :)

OpenStudy (anonymous):

R u sure? Please justify by figure or necessary proof.

OpenStudy (anonymous):

11 vertices creates no symmetry that includes two sides. therefore, connecting two sets of two points can never create two parallel lines. hence, no rectangles!

OpenStudy (anonymous):

Thanks a lot

OpenStudy (anonymous):

No problem

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