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anything less than 90 degrees
Acute - less than 90 degrees Right - exactly 90 degrees Obtuse - more than 90 degrees but less than 180 degrees
A angle less than 90 degrees is a acute angle.
An acute angle is greater than 0 but less than 90 degrees
An obtuse angle is any angle that measures more than 90 degrees but less than 180 degrees. Examples of items that can be described as having obtuse angles include corners of furniture, the shape of a kite, or the shape of a slice of pizza with a wide angle.