angle chasing in a figure (2021 Novosibirsk Oral Geo Oly 8.3)
Source:
May 24, 2021
geometryangles
Problem Statement
Find the angle in the quadrilateral of the figure.
https://cdn.artofproblemsolving.com/attachments/0/2/974e23be54125cde8610a78254b59685833b5b.png