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December 4th, 2016, 10:09 AM   #1
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I have a geometry problem to solve:
in the triangle ABC, the measure of BAC=120, ABC=20. In the inside of the triangle is a point O so that the measure of OAB=100 and OBA=10. Find the measure of OCA.

Thank you for the help.

Last edited by skipjack; December 5th, 2016 at 06:11 AM.
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December 5th, 2016, 07:40 AM   #2
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The answer is 10°, but I don't yet have an elegant proof of this.
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December 5th, 2016, 11:32 AM   #3
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that's true, we have to proof this without using trigonometry
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