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Geometric diagrams illustrating various triangles with given angles and unknown angles to solve.

A series of five geometric diagrams showing triangles with labeled angles and side lengths, including a right triangle, an isosceles triangle, and triangles with exterior angles, each with an unknown angle marked as x.

A series of five geometric diagrams showing triangles with labeled angles and side lengths, including a right triangle, an isosceles triangle, and triangles with exterior angles, each with an unknown angle marked as x.

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