supplementary angle 
noun Mathematics
Either of two angles whose sum is 180°.The supplementary angle of the interior angle, or the difference between the interior angle and 180°, is referred to as the ‘neighbour-avoidance index’....
- This lesson introduces supplementary angles and prepares students to figure angle sums of polygons.
- In this section, we are going to deal with vertical angles and supplementary angles in a different way.
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