it has No acute or obtuse angles
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No, because there is no acute angle in a circle.
An acute angle is an angle that goes from anywhere between 0 and 90 degrees. Another way of putting it is an acute angle is any angle that if the bend is at the centre of a circle it will cover a quarter or less of the circle.
An acute central angle will subtend an acute arc, or one that is less than 1/4 of the whole circle.
There are many such shapes. A circle is perhaps the most obvious.
1 acute angle = 1 acute angle