How do I quote Wikipedia?

How do I show that I quoted Wikipedia for an essay?
My math teacher said that it was okay to use Wikipedia, so I know that I'm allowed to use this website, but how do I quote from it?
It should be the same as citing any other website. The typical mode is to cut and paste the URL and give the date that you visited the site, but different school use different formats, so you should ask your teacher how to cite a website in his or her class.

Good luck!

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