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June 1st, 2018, 09:46 AM  #1 
Senior Member Joined: Jan 2012 Posts: 109 Thanks: 2  About cicumcenter & incenter
Hi, If, in a triangle ABC, the line joining the circumcenter & the incenter is parallel to BC, show that r = R cos A r = inradius R = circumradius Plz prove it. Thx. Last edited by skipjack; June 2nd, 2018 at 10:50 AM. 
June 1st, 2018, 09:54 PM  #3 
Senior Member Joined: Jan 2012 Posts: 109 Thanks: 2 
Oh.. I see.. Thx.


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cicumcenter, incenter 
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