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en.wikipedia.org/wiki/Proofs_of_trigonometric_identities

**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
...

www.answers.com/Q/Two_angles_whose_sum_is_90_degrees

en.wikibooks.org/wiki/Geometry/Angles

An angle is the union of two rays with a common endpoint, called the vertex. ...
complementary angles are

www.regentsprep.org/regents/math/geometry/gp5/langles.htm

An

www.algebra.com/algebra/homework/Angles/Angles.faq.question.514028.html

SOLUTION: complementary

www.freemathhelp.com/feliz-special-angles.html

As you may know,

answers.yahoo.com/question/index?qid=20080129231525AAHh5On

Jan 29, 2008

mathcentral.uregina.ca/QQ/database/QQ.09.99/suzanne1.html

We know that: Supplementary angles are

www.basic-mathematics.com/complementary-and-supplementary-angles.html

www.khanacademy.org/math/geometry/parallel-and-perpendicular-lines/complementary-supplementary-angl/v/complementary-and-supplementary-angles

And we already know that

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