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Point in triangle

Autor:Nenad Đapić
Temat:Kąty
Point O is in triangle ABC so that: <OAB = 30°, <OAC = 20°, <OBA = 10°, <OBC = 40°. Find <OCB. https://www.facebook.com/groups/575443962466000/permalink/986094674734258/

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