Having seven angles or seven corners; relating to a seven-sided geometric shape.
From Greek 'hepta' (seven) + Latin 'angular' (having angles, from 'angulus'). A geometric term combining Greek and Latin roots.
A heptangular polygon is a heptagon, and if you're trying to tile a surface with regular heptagons, you'll fail—it's mathematically impossible to completely cover a flat plane with regular seven-sided shapes, which blew mathematicians' minds.
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