Final answer:
The measure of the supplementary angle to a 3° angle is 177°, which is found by subtracting the given angle's measure from 180°.
Step-by-step explanation:
The question is asking for the measure of the supplementary angle of an angle that measures 3°. By definition, supplementary angles are two angles whose measures add up to 180°. Therefore, to find the measure of the supplementary angle, you subtract the measure of the given angle from 180°.
Let's perform the calculation:
- Measure of the given angle = 3°
- Measure of the supplementary angle = 180° - Measure of the given angle
- Measure of the supplementary angle = 180° - 3° = 177°
The correct answer is (a) 177°.