straight angle
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An angle whose measure is exactly 180 degrees is a straight angle.
It is: 144 degrees + 36 degrees = 180 degrees
An arc whose measure is less than 180 degrees is called a Minor Arc.
An angle with a measure of 180 degrees will look like a straight line with the vertex being a point in the center. Since a complete circle is 360 degrees, opening an angle to 180 degrees traces out exactly half a circle.
To get radian measure of angle given in degrees, multiple the measure in degrees by PI/180. Example: 60 deg = 60 * PI/180 rad = 1.047 rad.