they are called supplementary angles.
a straight line has 180 degrees each side and two adjacent angles forming 180 degrees are called supplementary angles.
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If the question refers to the total angle on a straight line then the angles are adjacent and supplementary - the angles total 180° .
Well, they're called vertically adjacent angles. They have the property that they are supplementary, because the non-adjacent sides form a straight line.
Sum of adjacent angles on a straight line.
Each angle is 180/5 = 36 degrees
they form a straight line