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3 right angles, tangential pentagon (2010 From Tasks to Tasks, p13 Ukr )

Source:

May 2, 2021
geometrypentagonright angletangential

Problem Statement

You can inscribe a circle in the pentagon ABCDEABCDE. It is also known that ∠ABC=∠BAE=∠CDE=90o\angle ABC = \angle BAE = \angle CDE = 90^o. Find the measure of the angle ADBADB.
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