i think a circle is irregular because it has no sides
It is irregular.
I am not positive but i think that a regular shaped object can be measured and an irregular can not Hope this helps :D
Pentagons can be regular or irregular.
regular or irregular
It is irregular.
A pentagon can be regular or irregular.
It is an irregular polygon.
Irregular.
Irregular
irregular
It is a 12 sided shape that can be either regular or irregular