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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