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Definitions for "Complementary angles"
Keywords:  angle, triangle, sum, bisects, ninety
Related Terms: Supplementary angles, Right angle, Obtuse triangle, Angle bisector, Orthogonal, Obtuse angle, Trigonometric functions, Cosine, Dihedral angle, Sine, Complementary angle, Straight angle, Trigonometry, Right triangle, Subtend, Acute angle, Cotangent, Angle, Corresponding angles, Acute triangle, Tangent, Perpendicular lines, Hypotenuse, Vertical angles, Adjacent angles, Angular, Perpendicular, Square, Skew, Pythagorean theorem, Rectangular, Interior angle, Alternate interior angles, Central angle, Perpendicular bisector, Orthogonality, Rectangle, Slant, Tilt angle, Inscribed angle, Perpendicularity, Congruent, Steradian, Regular polygon, Isosceles, Monoclinic, Decussate, Tetragonal, Included angle, Decagon
Two angles are called complementary is they add up to 90o. E.g. two acute angles in a right triangle are complementary.
math-terms.org
Two angles, the sum of whose measures is ninety degrees. Concept attainment: The process of creating categories by grouping similar objects and ideas…and by finding those attributes that are absolutely essential to the meaning and disregarding those that are not. The adult's role in the child's concept attainment process is to provide an enriched, idea-filled environment so that many examples of many concepts are encountered, and information and feedback regarding the accuracy of the concept definitions are given.
teacherlink.org
Two angles that add to give 90°, such as the two non-right angles in a right triangle, or the two angles on either side of a line that bisects a right angle. In the image to the right, lines AP and BP create a right angle. CP bisects this right angle. Angles and 2 are complementary, since they add to give 90°. See this link to Math League for more information on complementary angles.
rpi.edu
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