A straight angle is defined as 180 degrees.
If you didn't know that, you could take two of them and place them adjacent, or "back to back", and see that they add up to a full 360 degrees.
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straight angle
A straight angle is by definition 180°.
The angle should be of measure 180 degrees
That is a straight line.
An angle that forms a straight line has an angular measure of 180 degrees.