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incenter and orthocenter

Albert

Well-known member
Jan 25, 2013
1,225
 
Last edited by a moderator:

chisigma

Well-known member
Feb 13, 2012
1,704
What I see before 'attacking' the problem is that, without any serious failure of me, the 'demonstration' [if any...] would also demonstrate that trisection of an angle with only non graduate ruler and compass is possible... or not?...


Kind regards


$\chi$ $\sigma$
 

Albert

Well-known member
Jan 25, 2013
1,225
trisection of an angle with only non graduate ruler and compass is possible... or not?...
It is impossible to trisect any angle with only non graduate ruler and compass ,but some angles are possible, and this is unrelated to this problem .
 
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caffeinemachine

Well-known member
MHB Math Scholar
Mar 10, 2012
834
I need to show that the angle between $CH$(extended) and $HI$ measures $\frac{\angle B}{2}$. I am trying to give a purely geometric proof of this. Any hints on these lines?