What is the value of an angle that is supplementary to a 70-degree angle?

To find the value of an angle that is supplementary to a 70-degree angle, you need to remember that supplementary angles are two angles whose measures add up to 180 degrees.

Starting with the 70-degree angle, you can calculate its supplementary angle by subtracting it from 180 degrees:

180 degrees - 70 degrees = 110 degrees.

This calculation shows that the angle which is supplementary to a 70-degree angle is indeed 110 degrees. Understanding this principle is crucial, as supplementary angles play a significant role in various geometric applications and problems. Other options without the context of supplementary relationships do not sum with 70 degrees to give the necessary total of 180 degrees, thus reinforcing that 110 degrees is the correct answer.