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January 25, 2015

January 25, 2015

Posted by **raja** on Saturday, January 5, 2013 at 4:04am.

- math -
**Reiny**, Saturday, January 5, 2013 at 8:07amlet the angle be Ø

by the cosine law

7^2 = 3^2 + 5^2 -2(3)(5)cosØ

30cosØ = 9+25-49

cosØ = -15/30 = -1/2

Ø = 150°

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