MathDB
2010 Geometry #9

Source:

January 2, 2024
geometry

Problem Statement

Let ABCDABCD be a quadrilateral with an inscribed circle centered at II. Let CICI intersect ABAB at EE. If ∠IDE=35∘\angle IDE=35^\circ, ∠ABC=70∘\angle ABC=70^\circ, and ∠BCD=60∘\angle BCD=60^\circ, then what are all possible measures of ∠CDA\angle CDA?
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