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heptagon <a heptagon; heptagons> SUBST MATH

heptagon

مسبع

heptagon

سُباعي

heptagon

سباعي الزوايا

heptagon

مسبّعات

heptagon

شكل سباعي الأضلاع

heptagon

سُبَاعِيّ الزّوَايا والأضْلاع

anglais

However, there exist arbitrarily large sets of points in general position that contain no empty convex heptagon. en.wikipedia.org

Figure 7a shows a heptagon cut into smaller pieces (in two different ways) to yield a proof of the law of cosines. en.wikipedia.org

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