yes
yes you can tessellate a triangle and a pentagon together.
Yes, any type of triangle or quadrilateral will tessellate.
Yes under certain dimensional conditions.
No. Circles lack straight edges, and thus cannot tesselate with triangles.
yes
yes you can tessellate a triangle and a pentagon together.
No.
Yes.
Yes, they can tessellate provided they are suitably matched.
Yes.
Yes. Any triangle will tessellate.
Yes, any type of triangle or quadrilateral will tessellate.
No, a triangle will not tessellate by itself. In order for a shape to tessellate, it must be able to fit together with copies of itself without any gaps or overlaps. Triangles have angles that add up to 180 degrees, which does not allow them to fit together seamlessly to create a tessellation. Shapes like squares, hexagons, and equilateral triangles can tessellate because their angles allow them to fit together perfectly.
Yes under certain dimensional conditions.
Yes all triangles will tessellate
Sort of. Triangle is one of the shape that may tessellate(fit tightly). But one may argue that triangle is not a square (for sure), nor a tile (yet I think it may be) to a tessellate.