An acute angle is between 0 and 90 degrees. Angles between 90 and 180 degrees are called obtuse angles.
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A 120 degree angle is an obtuse angle. This means that the angle is between 90 and 180 degrees.
Acute. (More than 180 degrees reflex, between 90 and 180 obtuse)
Any angular size between 0 and 90 degrees. An OBTUSE angle is one whose size is between 90 & 180 degrees. A REFLEX angle is one whose angle is between 180 & 360 degrees. NB To correct your English grammar . The question should read ' What size is an acute angle'. When the noun following the indefinite article 'a', begins with a vowel 'a,e,i,o,u'. then the indefinite article is 'an'. In this case it is 'an acute', NOT 'a acute'.
An angle that measures less than 90 degrees is an acuteangle.Note:Angles less than 90 degrees are called "acute" angles.An angle that is exactly 90 degrees is called a "right" angle.Angles that are more than 90 degrees but less than 180 degrees are call "obtuse" angles.An angle that is exactly 180 degrees is called a "straight line".Angles that are more than 180 degrees and less than 360 degrees are called "reflex" angles.is called an acute angle. An obtuse angle measure in degrees is more than 90.