Key term for Edexcel GCSE Mathematics, used in Properties and Constructions.
Two angles that add up to exactly 180 degrees, such as co-interior angles between parallel lines.
Supplementary angles appears in Edexcel GCSE Mathematics revision content for Geometry and Measures, especially Properties and Constructions and Quadrilaterals and Triangles.
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Geometry and Measures
Properties and Constructions • Angles
