nonagon noun[ C ] uk /ˈnɒn.ə.ɡən/ us /ˈnɑː.nə.ɡɑːn/ a flat shape with nine straight sides九边形,九角形 SMART Vocabulary: related words and phrases Geometrical shapes -cornered circularly congruently conic cylindrically lozenge ovally ovoid parallelogram pentagon polyhedron polytope prism pyramid pyramidical quadrilateral rectangle rectangular rhombus three-dimensional
Examples of nonagon nonagon Three superimposed equilateral triangles at 40° intervals form a star nonagon. Below is a close approximation of a regular nonagon. From Wikipedia
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