EntityQ1269124· pop 10· linked from 6 articleskobon triangle problemSign in to savemathematical problemConnectionstriangleEntityInternational Standard Book NumberEntitymathematical proofEntitydigital object identifierEntityplaneEntitycombinatoricsEntitygroup theoryEntityparityEntityQ118398EntitypentagramEntitymodular arithmeticEntityOn-Line Encyclopedia of Integer SequencesEntityfloor and ceiling functionsEntitylist of unsolved problems in mathematicsEntityDesargues' theoremEntityPeter ShorEntitydiscrete geometryEntityMathematical ReviewsEntityprojective planeEntityPappus's centroid theoremEntityCategoriesDiscrete geometryRecreational mathematicsTrianglesUnsolved problems in geometry