Step 1
The supplementary angles refer to the pair of two angles whose sum is equal to 180 degrees.
Step 2
Consider the options
[tex]A)\text{ angle 1 = angle 2 (vertically opposite angles )not supplementary}[/tex][tex]B)\text{ angle 1 + angle 2 }=90^o(Complementary\text{ angles) not supplementary}[/tex][tex]C)\text{ angle 1 = angle 2 ( Vertically opposite angles) not supplementary}[/tex][tex]\begin{gathered} D)\text{ angle 1 + angle 2 = 180( sum of angles on a straight line)} \\ In\text{ option D, angles 1 and 2 are therefore supplementary} \end{gathered}[/tex]
Therefore, the right answer is option D.
