20 degrees. the definition of a supplementary angle is two angles that add up to 180 degrees.
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180 - angle = supplement 180- 160 = 20 degrees
The angle is 160 degrees and it's supplement is 20 degrees.
Providing that it is a regular polygon then each interior angle will measure 160 degrees
160 degrees
A = C = 180 - B = 80 So A + C = 160