adjacent angle
In
Supplementary adjacent angles
A pair of angles is supplementary if their measurements add up to 180 degrees. If the two supplementary angles are adjacent (i.e. have a common vertex and share a side, but do not have any interior points in common) their non-shared sides form a straight line.
Complementary adjacent angles
A pair of angles are complementary if the sum of their angles is 90°.
If the two complementary angles are adjacent (i.e. have a common vertex and share a side, but do not have any interior points in common) their non-shared sides form a right angle.
In Euclidean geometry, the two acute angles in a right triangle are complementary, because there are 180° in a triangle and 90° have been accounted for by the right angle. These angles would be adjacent.
External links
- Adjacent Angles animated demonstration. With interactive applet
- 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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