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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.

Contents

See also

External links

See also

★ Complementary angles

★ Angle

★ Triangles

★ Line Segment

External links

★ Animated demonstration - Interactive applet and explanation of the characteristics of supplementary angles.

★ Angle definition pages with interactive applets that are also useful in a classroom setting. Math Open Reference