anything less than 90 degrees
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There are three acute angles in an acute triangle and they add up to 180 degrees.
An acute angle is less than 90 degrees. Therefore, as a rectangle has 4 right-angles (90 degrees) there are no acute angles.
A regular pentagon has 5 exterior acute angles each of 72 degrees and 5 interior obtuse angles each of 108 degrees
Acute angles of angles that have a magnitude less than 90 degrees.
An ACUTE angle is any angle between, but NOT including, 0 to 90 degrees. 0 degrres ; no angle 90 degrees ; right angle. Angles between 90 and 180 degrees are OBTUSE Angles between 180 and 360 degrees are REFLEX.