Either a straight line or an about turn / about face.
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u rotated 180 degrees will be upside down and will look like an n. Sometimes answers changes when you say I in a question to be a u. If you are talking about capital I, it will look the same rotated 180 degrees. i will look like an exclamation mark upside down
A 140 degree angle is about half way between a 90 degree angle, which has lines that are perpendicular to each other, and a 180 degree angle, which is a straight line. A 140 degree angle is an obtuse angle which has a line a little over half way between the 90 degree and 180 degree angles.
It is an obtuse angle because it is greater than 90 but less than 180 degrees
360 degrees would be one full rotation. 180 degrees would be a half rotation. 360+180=540 So it would be a rotation and a half.
A straight line of 180 degrees