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  2. Proofs of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/Proofs_of_trigonometric...

    Two angles whose sum is π/2 radians (90 degrees) are complementary. In the diagram, the angles at vertices A and B are complementary, so we can exchange a and b, and change θ to π/2 − θ, obtaining: ⁡ (/) = ⁡

  3. Angle - Wikipedia

    en.wikipedia.org/wiki/Angle

    In Euclidean geometry, the two acute angles in a right triangle are complementary because the sum of internal angles of a triangle is 180 degrees, and the right angle accounts for 90 degrees. The adjective complementary is from the Latin complementum , associated with the verb complere , "to fill up".

  4. Cofunction - Wikipedia

    en.wikipedia.org/wiki/Cofunction

    In mathematics, a function f is cofunction of a function g if f(A) = g(B) whenever A and B are complementary angles (pairs that sum to one right angle). [1] This definition typically applies to trigonometric functions. [2] [3] The prefix "co-" can be found already in Edmund Gunter's Canon triangulorum (1620). [4] [5]

  5. Euclidean geometry - Wikipedia

    en.wikipedia.org/wiki/Euclidean_geometry

    Angles whose sum is a right angle are called complementary. Complementary angles are formed when a ray shares the same vertex and is pointed in a direction that is in between the two original rays that form the right angle. The number of rays in between the two original rays is infinite. Angles whose sum is a straight angle are supplementary ...

  6. Right angle - Wikipedia

    en.wikipedia.org/wiki/Right_angle

    In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or ... Two angles are called complementary if their sum is a right angle. [10]

  7. Internal and external angles - Wikipedia

    en.wikipedia.org/wiki/Internal_and_external_angles

    The interior angle concept can be extended in a consistent way to crossed polygons such as star polygons by using the concept of directed angles.In general, the interior angle sum in degrees of any closed polygon, including crossed (self-intersecting) ones, is then given by 180(n–2k)°, where n is the number of vertices, and the strictly positive integer k is the number of total (360 ...

  8. Complement - Wikipedia

    en.wikipedia.org/wiki/Complement

    Complement of an angle, the difference between a right angle (90 degrees) and a given angle; Knot complement; Complement of a point, the dilation of a point in the centroid of a given triangle, with ratio −1/2

  9. Complementarity - Wikipedia

    en.wikipedia.org/wiki/Complementarity

    Complementarity (physics), the principle that objects have complementary properties which cannot all be observed or measured simultaneously; Complementarity theory, a type of mathematical optimization problem; Quark–lepton complementarity, a possible fundamental symmetry between quarks and leptons

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