The ones in the question are correct. Well done!
irregular means not regular. regular means (look up in dictionary.com). BTW, check your spelling!
It is irregular.
Pentagons can be regular or irregular.
regular or irregular
It is irregular.
Irregular verbs are verbs that change their spelling when written in past tense. These verbs do not follow the regular pattern of adding "-ed" to form the past tense.
A pentagon can be regular or irregular.
It is an irregular polygon.
That is the correct spelling of "irregular" (not standard, not typical).
Irregular.
Irregular
"Have" is an irregular verb in English.