The relationships that exist angles 1 and 2 is that they are supplementary angles.
What are supplementary angles?
This type of angle is said to be two angles that are called supplementary only when their measures is known to add up to 180 degrees.
That is they have to be 180 degrees. when they are sum up together. Note that the angles above are supplementary angles, because angle 1 + angle 2 = 180° .
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