Yes they have straight lines no curves and angles.
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squares and triangles :/
Equilateral triangles, squares, and hexagons.
Triangles, squares and hexagons. That is if they all have to be the same. If you use different regular polygons, you can tile a flat surface with triangles and 12-sides or with squares and 8-sides for example.
Regular polygons such as squares and equilateral triangles
Regular polygons have congruent angles such as squares and equilateral triangles.