A reflex angle
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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.
Every obtuse angle. There are an infinite number of them.
The sine of an angle is obtained from a right angle triangle. The other two angles are acute, or less than 90 degrees. The sin of the angle is the side opposite the angle divided by the hypotenuse.
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