Question

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

Explanation:

A tessellation is a tiling of a plane with shapes that form a repeating pattern, have no gaps/overlaps, and typically use congruent shapes. However, curved shapes (like circles cannot tessellate, but some curved shapes combined can) or shapes with non-straight sides can be part of tessellations, so straight sides are not required.

Answer:

A. using shapes with straight sides