A pair of supplementary angles whose values add up to 180°

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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. The supplement of 135 would be 45.

See also

• Complementary angles
• Triangles
• Line segment

External links

• [1] - 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

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