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The greek letter theta is usually used to denote an unknown angle. An angle of 90 degrees is a right angle, an angle between 0-90 degrees is an acute angle, bigger than 90 degrees but less than 180 is an obtuse angle, and bigger than 180 but less than 360 is a reflex angle.
An angle of 361 degrees is bigger than 180 deg and 360 deg.
it is the angle that is bigger than 90% but smaller than 180%
An angle greater than 90 but less than 180 degrees is an obtuse angle.
an obtuse angle if it is less than 180 but a reflex angle if it is greater than 180 & still less than 360