one three-hundred-and-sixtieth of the circumference of a circle
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The whole measurement of a angle.
It is a 90 degree angle, which can be formed by two perpendicular lines.
Means a device which measures the angle of the boom relative to horizontal. Enable to determine measurements to a precision degree.
Reflex angle is "A Reflex Angle is more than 180° but less than 360°" by definition; however, if the "20°" you are talking about is the "acute" angle, then the reflex angle is: 360° - 20° = 340°
A 150 degree angle is an obtuse angle because it is greater than 90 but less than 180 degrees