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If I understand the question correctly, then 0 degrees or 180 degrees.
Yes. A supplementary angle is two angles with a common ray that equal 180 degrees.
180 degrees
144 degrees. from the triangle (180 degrees) to find the degrees of shapes with one more side, add 180 degrees. e.g. triangle (3 sides) - 180 degrees quadrilateral (4 sides) - 180 + 180 = 360 degrees
A straight line is 180 degrees.