a straight line
or
supplementary angles...which equal to 180 degrees.
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An obtuse angle
A straight angle is an angle that measures 180 degrees and is drawn as a straight line. A straight angle is composed of two right angles whose measures are 90 degrees each.
a straight angle
An angle that measures 180 degrees would be in a straight line. Therefore, this angle is known as a straight angle.
An obtuse angle