What is the supplementary angle of 18 degrees? Here we will define the supplementary angle of 18 degrees, show you how to calculate the supplementary angle of 18 degrees, and even illustrate the supplementary angle of 18 degrees (18°) so you have a solid understanding of what it means.
The supplementary angle of 18 degrees, also known as the supplement angle of 18 degrees, is the angle that when added to 18 results in a sum of 180. Therefore, to calculate the supplement angle of 18 degrees, we subtract 18 from 180. Here is the formula, the math, and the answer:
180 - angle = supplement angle
180 - 18 = 162
162 degrees
18 degrees plus the supplementary angle of 18 degrees equals 180 degrees, which means that together they will make a straight line.
The illustration below shows 18 degrees colored in red and the supplementary angle of 18 degrees, which is 162 degrees, colored in green.
As you can see from the illustration above, 18 degrees and 162 degrees form a straight line together. This proves that the two angles, 18 degrees and 162 degrees, are supplementary angles.
Supplementary Angle Calculator
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Supplementary angle of 18.1 degrees
Here is another trigonometry math problem that we have illustrated and calculated the answer to.