Supplementary angles

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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 170 would be 10.

[edit] See Also

Complementary angles
Triangles
Line segment
Parallel lines

[edit] 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