Let ABC be a triangle such that angle ACB = 135°. Prove that:
I really have no Idea how to solve this, any help is really appreciated. Thanks
You can also form a right-angled triangle by standing the triangle on side CB (or side AC).
Drop a vertical to O from A and join O to C such that OCB is a straight line.
This requires only Pythagoras' Theorem.
Last edited by Archie Meade; Jul 20th 2010 at 02:33 PM.