An angle is an amount of turning.
Some polygons have internal angles over 180 (when the external angle is less than 180).
You can think of the hands of a clock. If the longer hand moves 180 degrees in 30 minutes, it moves 270 degrees in 45 minutes or 720 degrees in two hours, etc.
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An angle that measures more than 90 degrees and les than 180 degrees is an obtuse angle.
A reflex angle. Assuming the angle is also less than 360 degrees.
An arrowhead
Obtuse. Any angle measuring greater than 90 degrees but less than 180 is considered obtuse. An acute angle is any angle measuring between 0 and 90 degrees. A right angle is an angle measuring exactly 90 degrees while a straight angle measures exactly 180 degrees.
obtuse: greater than 90 degrees right: 90 degrees acute: less than 90 degrees