Is a rectangle a regular polygon

No

Step-by-step explanation:

A regular polygon must be both equilateral (all sides are the same length) and equiangular (all angles must be the same). However, a rectangle can never, by definition, be equilateral. All of its sides can never be the same length and so, it can never be regular.

no

Step-by-step explanation:

to be a regular polygon all sides must be same equilateral.