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H is the orthocenter of acute triangle ABC and the extensions of AH, BH, and CH intersect the circumcircle of traingle ABC at A prime, B prime and C prime. We know angle AHB : angle BHC : angle CHA = 9 : 11 : 13. Find angle AprimeBprimeCprime in degrees.

 

 Oct 31, 2020
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Angle A'B'C' is 45 degrees.

 Nov 15, 2020

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