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File:Roberts triangle theorem n=7.svg

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English: Seven lines tangent to a semicircle form five triangular faces. According to Roberts's triangle theorem, every lines with no two parallel and no three meeting at a point must form at least triangular faces; this construction shows that this bound cannot be improved.
Date
Source Own work
Author David Eppstein

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Seven lines tangent to a semicircle form five triangular faces

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27 October 2022

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Date/TimeThumbnailDimensionsUserComment
current23:57, 27 October 2022Thumbnail for version as of 23:57, 27 October 2022432 × 504 (665 bytes)David EppsteinUploaded own work with UploadWizard

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