What is the difference between Arabic and Persian and Farsi?

How different are they from each other? Can someone who speaks Arabic understand Persian or Farsi speakers in Iran? And Why is Persian considered an Indo-European language.... The Romance and Germanic languages are Indo-european and I don't see much similarities between them and Persian... Not that I really... show more How different are they from each other? Can someone who speaks Arabic understand Persian or Farsi speakers in Iran? And Why is Persian considered an Indo-European language.... The Romance and Germanic languages are Indo-european and I don't see much similarities between them and Persian... Not that I really know much of persian...
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