The 80-80-20 Triangle Problem, A Variant
The isosceles triangle with the apex angle of 20° and the base angles of 80° is a recurring subject of geometric problems. The most popular is the one where cevians are drawn from the base vertices at angles of 50° and 60°, and the task is to determine one of the so formed angles.
A novel problem has been suggested by Radheyshyam Poddar:
ABC is an isosceles triangle with vertex angle
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