The term "supplementary" refers to something that is added to enhance or complete something else. In various contexts, it can describe additional materials, resources, or information that support a primary subject. For example, in education, supplementary materials like worksheets or videos can help reinforce learning. In mathematics, supplementary angles are two angles whose measures add up to 180 degrees. This concept is important in geometry, where understanding the relationships between angles can aid in solving problems. Overall, supplementary elements serve to provide extra support or clarification in different fields.