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In English, regular nouns make their plural by adding -s (or -es, if they end in s/z sounds). Irregular nouns make their plurals in other ways. Some examples: Regular: dog - dogs cat - cats horse - horses bus - buses Irregular: man - men mouse - mice goose - geese sheep - sheep
It is irregular.
Pentagons can be regular or irregular.
It is irregular.
A pentagon can be regular or irregular.