![]() If you'd like some ideas of angles to calculate, take a look at the random list in the sidebar and try to solve them without checking the answer first. Give this a try for yourself and try to work out the supplementary angles of any given angle which is less than 180°. This means that the supplementary angle of 21 degrees is 159 degrees. You should now be able to see the answer to this problem forming, as we just need to deduct 21 from 180 to get our supplementary angle: Let's rearrange the equation using algebra to work out the supplement of 21°: ![]() What we need to do is solve this equation so that we can find S, the supplementary angle. We know that the supplementary angle added to the given angle of 21° equals 180 degrees. To start with, let's set up the problem we are trying to solve as an equation. This is a very simple problem to solve, and we can work out the supplement of 21 degrees using some basic algebra. In this example, we are trying to calculate the supplementary angle for the given angle of 21 degrees. What is the Supplementary Angle of 21 Degrees?Ī supplementary angle is the angle which produces a straight line of 180° when added to the given angle.
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