MathDB
incircle of triangle inscribed in semicircle (2019 Novosibirsk Oral Geo Oly 8.2)

Source:

April 28, 2021
geometryincirclesemicircle

Problem Statement

The circle is inscribed in a triangle, inscribed in a semicircle. Find the marked angle aa. https://cdn.artofproblemsolving.com/attachments/8/e/334c8662377155086e9211da3589145f460b52.png