In math, the definition of a supplementary line is A line where the two or more angles within the line equal 180 degrees.
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they form a straight line
they are called supplementary angles. a straight line has 180 degrees each side and two adjacent angles forming 180 degrees are called supplementary angles.
A supplementary angle is the angle which produces a straight line of 180° when added to the given angle. To find the supplementary angle, subtract 84° from 180°. The answer will be 96°.
A horizontal line is a line that is parallel to the horizon.
No, because the sum of the 3 angles of a triangle always equals 180 degrees. If two angles are supplementary by definition the two together already sum to 180 degrees, leaving no "space" for the third angle.