Michael J. answered 05/18/17
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Effective High School STEM Tutor & CUNY Math Peer Leader
Use "a" (indefinite article) when referring to general nouns that begins with constanants.
ex: a bar , a chair, a snake
Use "an" (indefinite article) when referring to general nouns that begin with a vowel.
ex: an apple, an octagon, an igloo
Use "the" (definite article) when referring to specific or unique nouns.