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Diagram explaining angle relationships in a triangle, including interior and exterior angles and their sums.

Handwritten diagram illustrating angle relationships in a triangle, showing interior angles a, b, c summing to 180°, and exterior angles d, e, f with equations a+b=d, b+c=f, a+c=g.

Handwritten diagram illustrating angle relationships in a triangle, showing interior angles a, b, c summing to 180°, and exterior angles d, e, f with equations a+b=d, b+c=f, a+c=g.

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