What is the fallacy referred to as "petitio principii" also known as?

The fallacy referred to as "petitio principii" is indeed known as a circular argument. This fallacy occurs when an argument's premises assume the truth of the conclusion instead of supporting it. In other words, the argument relies on what it is trying to prove, making the reasoning circular.

For example, if someone argues that "I am trustworthy because I am honest," they are using reasoning that assumes their trustworthiness to prove it, which does not provide an independent basis for the claim. This lack of external support means the argument does not progress logically, effectively making it a circular argument.

Understanding this fallacy helps in identifying weak arguments where the conclusion is simply restated rather than substantiated, which is crucial for critical thinking and effective communication in English Language Arts.