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Topic: Parallelogram Orthocenters
Replies: 7   Last Post: Oct 22, 2013 7:28 AM

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Avni Pllana

Posts: 546
Registered: 12/6/04
Re: Parallelogram Orthocenters
Posted: Oct 18, 2013 11:20 AM
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> Let ABCD be a parallelogram such that AB=3DDC=3D10, and
> AD=3DBC=3D6,
> and angle(BAD)=3D60=C2=B0. Let H1,H2 be the orthocenters of
> triangles ABD and CDB respectively. Determine the
> distance between H1 and H2.
> Best regards,
> Avni

Even the incenter I1 is concyclic with C,D,B, see attachment.

Best regards,

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