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October 22, 2014

October 22, 2014

Posted by **Knights** on Thursday, April 4, 2013 at 11:57am.

I don't understand....it is not cosine 60, so could someone help?

- Trigonometry - Cosine of angle -
**Steve**, Thursday, April 4, 2013 at 1:31pmcos is 1/3

wikipedia has a nice article on tetrahedra

- Trigonometry - Cosine of angle -
**Knights**, Thursday, April 4, 2013 at 3:02pmthanks a lot Steve!

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