Final answer:
The supplementary angle to an 85-degree angle is 95 degrees; subtract the angle from 180 degrees to find the supplement.
Step-by-step explanation:
The supplement of an angle is what you add to that angle to make a straight line, which is 180 degrees. So, to find the supplement of an 85-degree angle, you subtract the given angle from 180 degrees. The calculation is as follows:
180 degrees - 85 degrees = 95 degrees.
Therefore, the supplementary angle of an 85-degree angle is 95 degrees.