Final answer:
The supplement of a 155° angle is the angle that added to 155° equals 180°. Through simple subtraction (180° - 155°), one finds that the supplement measures 25°. However, this measure is not listed in the multiple-choice options provided.
Step-by-step explanation:
To find the measure of the supplement of a 155° angle, one must understand the concept of supplementary angles. Supplementary angles are two angles whose measures add up to 180°. Since we have one angle measured at 155°, the supplement will be the difference between 180° and 155°.
So, the calculation we need to make is:
Therefore, the correct answer is a supplement of 25°, which is not present in the provided options (A) 115° (B) 140° (C) 180° (D) 225°. Hence, there seems to be a mistake in the list of options provided with the question.