Adjacent angles: Difference between revisions

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In the illustration, angles A and B are adjacent.

In geometry, adjacent angles, often shortened as adj. ∠s, are angles that have a common ray coming out of the vertex going between two other rays, with no overlap of the regions "enclosed" by the two angles. In other words, they are angles that are side by side, or adjacent.

Complementary adjacent angles

A pair of angles is complementary if the sum of their measures is 90°.

A pair of angles is supplementary if the sum of their measures is 180°. An example would be: Angle C is 40° and Angle D is 140°. Because angle C and D both add up to 180°, they are supplementary angles. An angle with a ray connected to a common point down the center. In geometry, two angles are adjacent angles if they share a common vertex and side, but have no common interior points.

External links

Complementary Angles animated demonstration. With interactive applet
Supplementary Angles animated demonstration. With interactive applet
Angle definition pages with interactive applets that are also useful in a classroom setting. Math Open Reference

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 A pair of angles is [[complementary angles|complementary]] if the sum of their measures is 90°.
-A pair of angles is [[supplementary angles|supplementary]] if the sum of their measures is 180°. Example angle A is 40° and angle B is 140° this is a supplementary angle
+A pair of angles is [[supplementary angles|supplementary]] if the sum of their measures is 180°. An example would be: Angle C is 40° and Angle D is 140°. Because angle C and D both add up to 180°, they are supplementary angles.
 An angle with a ray connected to a common point down the center. In geometry, two angles are adjacent angles if they share a common vertex and side, but have no common interior points.