They can tesselate - provided they are the correct shapes.
Yes, every triangle will tessellate.
Yes, any triangle will tessellate.
Yes they do tessellate
Triangle, square, hexagon.
No. Circles lack straight edges, and thus cannot tesselate with triangles.
No only three can tesselate. they are: An equilateral triangle, a square and a 6 sided hexagon.
By themselves, only 3: triangle, square and hexagon. But there are combinations: eg octagon + square.
Yes, all triangles will tesselate. Twiddle your triangle round so one side is horizontal, and it's easier to see then.
Yes, rectangles tesselate. A tessellation is a tiling pattern.
Because angles on a straight line add up to 180 degrees and the 3 interior angles of any triangle add up to 180 degrees. So it follows that all triangles will tessellate.
No.