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Co-interior angles add up to 180° when two parallel lines are cut by a transversal; identified by a C shape.

Diagram illustrating co-interior angles formed between two parallel lines intersected by a transversal, showing angle pairs g and h, and i and j, with equations g + h = 180° and i + j = 180°, and a visual C shape to identify the angles.

Diagram illustrating co-interior angles formed between two parallel lines intersected by a transversal, showing angle pairs g and h, and i and j, with equations g + h = 180° and i + j = 180°, and a visual C shape to identify the angles.

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