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Angry at is used at what time?

angry with is used in what situation?

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Both are common phrases.

"Angry with" + person.

"Angry at" + a person (informal) or a situation.

 Was he angry at his fellow citizens' unfair treatment of him?
Grant's family is angry at what they regard as his half-hearted efforts to reform.
The reporter became visibly angry at the threat.
Italians are increasingly angry at Mr Berlusconi's failure to act.
I am angry at the process used in our congress in crafting health care reform.