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Topic: hi,friends(4)
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China -->hk

Posts: 43
Registered: 1/23/07
hi,friends(4)
Posted: May 26, 2007 3:52 AM
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hi,friends:
please help me!
A quadrilateral ABCD inscribed in a circle, and side AB,DC meet(intersect) at E,side AD,BC meet(intersect) at F,angle E's bisector line EP and angle F's bisector line FP meet at P,then EP is perpendicular to FP. How can we using vector to prove it?



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