OBTUSE ; The word obtuse means 'blunt'.
ACUTE ; is an angle between '0' and 90 degrees. The word 'acute' means sharp'.
The third type of angle is REFLEX , which is an angle between 180 degrees and 360 degrees. The word 'reflex' means ' turned over' or 'turned aginst'.
NB For any given point with two lines radiating from the point, the smaller angle can be either acute or obtuse, but the outside angle is always 'REFLEX'.
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An angle of between 90 degrees and 180 degrees is called an obtuse angle, an angle that is exactly 180 degrees is called a straight angle (because it creates a straight line), and an angle of more then 180 degrees is called a reflex angle.
It is called an obtuse angle. ■
That is an obtuse angle.
It is called a reflex angle.
An angle which measures between 180 and 360 degrees is called a reflex angle.