Question

1. which is not a tessellation?

Explanation:

A tessellation is a pattern of shapes that fit together without any gaps or overlaps. The first option (triangles) can tessellate as equilateral triangles can cover a plane. The second option (hex - like shapes) can also tessellate (similar to a honeycomb structure). The fourth option (a repeating pattern) can be a tessellation. However, the third option has irregular shapes that do not fit together without gaps or overlaps.

Answer:

The third option (the one with irregular blue and light - blue shapes) is not a tessellation.