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File:Isotoxal star simple 18-gon fitting regular star 9÷4-gon outline.png

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Summary

Description
English: |9/4| (isotoxal star simple 18-gon) fitting {9/4} (regular star 9/4-gon) outline.

Possible coordinates for outer vertices:
R·(cos(k2π/9+π/2);sin(k2π/9+π/2)) where R = outer radius and k ∈ {0,...,8}.
Examples: «head»: k = 0; left «foot»: k = 4; right «foot»: k = 5.

Corresponding coordinates for inner vertices:
2·sin(π/18)·R·(cos(k2π/9+11π/18);sin(k2π/9+11π/18)) where k ∈ {0,...,8}; 2·sin(π/18)·R = inner radius.

|9/4| and 9 equilateral triangles (between its 9 points) tile a regular simple 9-gon.

|9/4| is not the File:Bahai star.svg, whose points are slightly shorter.
Date
Source Own work
Author JavBol

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Captions

|9/4| (isotoxal star simple 18-gon) fitting {9/4} (regular star 9/4-gon) outline

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1 April 2024

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Date/TimeThumbnailDimensionsUserComment
current00:47, 1 April 2024Thumbnail for version as of 00:47, 1 April 2024984 × 971 (125 KB)JavBolUploaded own work with UploadWizard

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