Two angles are supplementary. One angle measures 26° Find the measure of the other angle.

Supplementary means it has to equal 180 all together so 180-26=154.
The other angle is 154 degrees

When an angle is supplementary, it means that they combine to 180 degrees. If you know that and the angle measure of the other angle, you can set up the equation 180=angle1+angle2. For this problem, the equation would be 180=26+angle2. Subtract 26 from both sides, and you get that the second angle is 154 degrees.