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Geometric problems involving finding unknown angles in triangles with given angle measures and side markings.

Five geometric diagrams showing triangles with labeled angles and side markings, including a right triangle, an isosceles triangle, and triangles with exterior angles, each with an unknown angle marked as x.

Five geometric diagrams showing triangles with labeled angles and side markings, including a right triangle, an isosceles triangle, and triangles with exterior angles, each with an unknown angle marked as x.

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