Final answer:
The angle supplementary to an angle measuring 165° is 15°.
Step-by-step explanation:
The angle supplementary to an angle measuring 165° is the angle that, when added to 165°, will result in a sum of 180°. Since supplementary angles add up to 180°, we can subtract 165° from 180° to find the measure of the supplementary angle.
180° - 165° = 15°.
Therefore, the angle supplementary to the angle measuring 165° is 15°.