File talk:Newtons proof of Keplers second law.gif
Newton didn't make it clear how A2 = A3. He used a fixed rate. Richard Feyneman, in one of his freshman physics lectures, used a fixed angle and came up with a proof that closes. We (one of us) should add that proof.
Talk pages are where people discuss how to make content on Wikipedia the best that it can be. You can use this page to start a discussion with others about how to improve the "File:Newtons proof of Keplers second law.gif" page.
