Triangle ABC is isosceles triangle with AB = AC. And angle A = 20°. Point D is on side AC such that angle CBD = 70°. Similarly, point E is on side AB such that angle BCE = 60°. Now, points D and E are joined. Then find measure of angle BDE. I found other angles. I tried using sine rule. But, its getting harder by applying sine rule. I don't know whether I am missing some important theorem. Please help. I'm sorry that I'm unable to provide diagram.
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Please indicate how you could or not proceed. – Narasimham Apr 29 '20 at 09:59
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Posted here several times. I'll try to find one. Ah – https://math.stackexchange.com/questions/3620825/langleys-adventitious-angles – Gerry Myerson Apr 29 '20 at 10:20
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1@GerryMyerson Thank you so much I understood the solution. – Suraj Apr 29 '20 at 10:47