Definition--Angle Concepts--Complementary Angle
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Geometry >> Angles and Planes >> Definition of an Angle

Definition--Angle Concepts--Complementary Angle

Complementary Angle

Complementary Angle

Topic

Angles

Definition

Complementary angles are two angles whose measures add up to 90 degrees.

Description

Complementary angles are a fundamental concept in geometry, often used in solving problems involving right triangles and angle relationships. They are frequently encountered in trigonometry, where the sine of an angle is equal to the cosine of its complement. In real-world applications, complementary angles are used in design and architecture to ensure that elements fit together correctly, such as in the construction of right-angled structures. In education, understanding complementary angles helps students develop skills in angle measurement and geometric reasoning, forming a basis for more advanced studies in mathematics.

Complementary Angle
How do you know the marked angles 
are complementary?

For a complete collection of terms related to Angles click on this link: Angles Collection.

Common Core Standards CCSS.MATH.CONTENT.2.G.A.1, CCSS.MATH.CONTENT.4.MD.C.5, CCSS.MATH.CONTENT.4.G.A.1, CCSS.MATH.CONTENT.7.G.B.5
Grade Range 4 - 8
Curriculum Nodes Geometry
    • Angles and Planes
        • Definition of an Angle
Copyright Year 2013
Keywords angle, definitions, glossary term