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# Find the value of x

Find the value of x

Prove the following: If, in a triangle $$ABC$$, $$\angle BAO = \angle OAC = \angle 20^\circ$$, $$\angle ACO= 10^\circ$$ and $$\angle OCB = 30^\circ$$, then $$\angle OBC = 80^\circ$$. Try to use elementary geometry (Euclid's Elements).

Note by Aly Ahmed
3 months, 1 week ago

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