180
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One line segment is 180 degrees because it is a straight line. If you have 2 or more intersecting line segments, the degree of the angle will vary.
A straight angle also known as a line
An obtuse angle is an angle between 90 degrees and 180 degrees. A 180 degree angle is a straight horizontal line. So you can imagine that a 160 degree angle is almost but not quite horizontal.
it is the clock wise angle in radian or degree from heading of vessel to a straight line drawn from the station on the vessel to the object.
Bigger than 90 (a right angle), less than 180 (a straight line).