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3 squares in a row, find sum of 2 angles

Source: 2001 Estonia National Olympiad Final Round grade 10 p3

March 12, 2020
anglesSumgeometry

Problem Statement

There are three squares in the picture. Find the sum of angles ADCADC and BDCBDC. https://cdn.artofproblemsolving.com/attachments/c/9/885a6c6253fca17e24528f8ba8a5d31a18c845.png