Answer;
-Line
Two adjacent, supplementary angles form a straight line
Explanation;
- Supplementary angles are those angles whose sum add up to 180 degrees. Thus, two angles are said to be supplementary if their sum adds up to 180 degrees.
- Similarly, angles on a straight line add up to 180 degrees, which means they are supplementary angles.
- Thus, two adjacent supplementary angles add up to 180 and it means they are on a straight line.
