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#1 2008-07-15 22:20:44

tony123
Member
Registered: 2007-08-03
Posts: 228

cyclic quadrilateral

In a cyclic quadrilateral ABCD, prove that

Last edited by tony123 (2008-07-15 22:21:43)

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#2 2008-07-16 03:13:06

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: cyclic quadrilateral

In a cyclic quadrilateral, opposite angles are supplementary. Say, C is opposite to A and D is opposite to B. Then

and

and

and

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#3 2008-07-16 23:46:01

Identity
Member
Registered: 2007-04-18
Posts: 934

Re: cyclic quadrilateral

So both sides equal 0 ! Wow

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