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Topic: Locus connected with the Simson point
Replies: 2   Last Post: Sep 26, 2009 4:33 PM

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Posts: 3
Registered: 7/31/07
Locus connected with the Simson point
Posted: Jul 31, 2009 8:11 AM
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It all started with an interesting theorem from

Paul Yiu, Heptagonal triangles and their companions, Forum
Geometricorum Volume 9 (2009), 125--148

which stated that: In a regular heptagon ABCDEFG the Simson lines for
B, C and G in respect to the triangle AEF are concurrent.

This got me thinking about the locus of all points P whose Simson
likes with respect to a given triangle ABC pass through a given point
S. A straightforward calculation seems to suggest that said locus is a
hyperbole, if I did not mess up the calculations.

Does someone have a reference for this?

A more interesting question arises with respect to the above-mentioned
Yiu's theorem. If indeed the locus is a hyperbole then B, C and G lie
on it. Hence there should be a fourth point on the circle on which B,C
and G lie whose Simson line also passes through the same point.

Which is this point?

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