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Co-interior angles between parallel lines add up to 180°—identified by a C shape.

Diagram illustrating co-interior angles formed between two parallel lines intersected by a transversal, showing that the angles on the same side of the transversal add up to 180 degrees, with examples labeled g + h = 180° and i + j = 180°, and a visual tip to spot co-interior angles by drawing a C shape.

Diagram illustrating co-interior angles formed between two parallel lines intersected by a transversal, showing that the angles on the same side of the transversal add up to 180 degrees, with examples labeled g + h = 180° and i + j = 180°, and a visual tip to spot co-interior angles by drawing a C shape.

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