1. The problem is to find the supplementary angle of 135 degrees.
2. Supplementary angles are two angles whose measures add up to 180 degrees.
3. The formula to find the supplementary angle $x$ of a given angle $\theta$ is:
$$x = 180 - \theta$$
4. Substitute $\theta = 135$ into the formula:
$$x = 180 - 135$$
5. Calculate the difference:
$$x = 45$$
6. Therefore, the supplementary angle of 135 degrees is 45 degrees.
Supplementary Angle
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