What is the supplementary angle of 20.4 degrees? Here we will define the supplementary angle of 20.4 degrees, show you how to calculate the supplementary angle of 20.4 degrees, and even illustrate the supplementary angle of 20.4 degrees (20.4°) so you have a solid understanding of what it means.
The supplementary angle of 20.4 degrees, also known as the supplement angle of 20.4 degrees, is the angle that when added to 20.4 results in a sum of 180. Therefore, to calculate the supplement angle of 20.4 degrees, we subtract 20.4 from 180. Here is the formula, the math, and the answer:
180 - angle = supplement angle
180 - 20.4 = 159.6
159.6 degrees
20.4 degrees plus the supplementary angle of 20.4 degrees equals 180 degrees, which means that together they will make a straight line.
The illustration below shows 20.4 degrees colored in red and the supplementary angle of 20.4 degrees, which is 159.6 degrees, colored in green.
As you can see from the illustration above, 20.4 degrees and 159.6 degrees form a straight line together. This proves that the two angles, 20.4 degrees and 159.6 degrees, are supplementary angles.
Supplementary Angle Calculator
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