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October 22, 2014

October 22, 2014

Posted by **Gabby** on Sunday, January 13, 2013 at 9:49pm.

- Pre-Calculus -
**Reiny**, Sunday, January 13, 2013 at 10:04pmLooks like the angle at B is 150° and we can just use the cosine law:

AC^2 = 12^2 + 9^2 - 2(12)(9)cos 150°

= 225 - 216( -√3/2)

= ....

AC = + √ .....

I got AC = appr 20.3

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