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Geometric problems involving triangle angle calculations with given angles and side markings.

A series of five geometric diagrams (a-e) showing triangles with labeled angles and sides, including right triangles, isosceles triangles, and triangles with exterior angles, used to solve for unknown angles.

A series of five geometric diagrams (a-e) showing triangles with labeled angles and sides, including right triangles, isosceles triangles, and triangles with exterior angles, used to solve for unknown angles.

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