Supplementary angles.
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A straight angle is a line which has an angle of 180 degrees therefore two right angles (90 degrees) make a line.
Any angles A, B where A + B = 180 deg.
How many of these 30° angles will fit together to make a straight line?
A linear pair would be two angles that form a straight angle of 180 degrees.
When 2 or more angles add up to 180 degrees they are said to be supplementary. Supplementary angles only occur on straight lines, so if one angle is said to be 120 the other angle has to be 60 degrees in order to form a straight line and also to add the angles to 180 degrees