Albert1
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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 .chisigma said:trisection of an angle with only non graduate ruler and compass is possible... or not?...
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?Albert said:![]()