Question

1. which is not a necessary characteristic of a tessellation? congruent shapes repeating pattern using shapes with straight sides no gaps or overlaps

Explanation:

A tessellation is a pattern of shapes that fit together without gaps or overlaps. It can have a repeating pattern. Also, shapes with straight sides are commonly used, but it's not a strict requirement (for example, some curved - shape tessellations can be created with more complex arrangements). Congruent shapes are not necessary as similar - shaped (but not congruent) shapes can also form a tessellation in some cases. However, the key non - necessary characteristic here is that congruent shapes are not a must - have.

Answer:

congruent shapes