Posted by mathsen on Saturday, August 7, 2010 at 1:37am.
Let ABC be a triangle such that angle ACB = 135 degrees. Prove that
AB^2 = AC^2 + BC^2 + ¡Ì2 x AC x BC.

math  Jen, Saturday, August 7, 2010 at 8:11am
You did not attempt any of the many problems you listed, therefore, don't be surprised if nobody chooses to help you.

math  GuruBlue, Saturday, August 7, 2010 at 10:38am
We do not do your homework for you. After you have worked the problems, a teacher will be happy to make suggestions or corrections.
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