Hexagon.
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If it's interior angle is a factor of 360 then it will tessellate such as a square, a regular hexagon and an equilateral triangle.
An [equilateral] triangle, square and hexagon are the only regular polygons which, by themselves, will tile a surface.
Equilateral triangle, square and regular hexagon.
Triangle, square and hexagon
Equilateral triangle, square and regular hexagon.