An Angle between 90 degrees and 180 degrees is OBTUSE.
NB An angle less than 90 degrees is ACUTE
An angles between 180 degrees and 360 degrees is REFLEX.
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A reflex angle
The isosceles triangle will have a top angle of 66 degrees and two equal base angles of 57 degrees which all add up to 180 degrees.
The supplementary angle of 57 degrees is 123 degrees The complementary angle of 75 degrees is 15 degrees So: 123 minus 15 = 108 degrees
It is a reflex angle because it is greater than 180 degrees.
3rd quadrant. The four 90 degree quadrants together formed 360 degrees. When a given angle is greater than 360 degrees, subtract 360 from it till a value smaller than 360 is obtained. In this way, we can determine the quadrant in which the given angle lies. Here the final angle obtained is 211 degrees (1291-3x360=211).