Answer:
An "Acute angle".
Explanation:
Any angle that is smaller than 90° is an "Acute angle", and any angle that is bigger than 90° and less than 180° is an "Obtuse angle", and any angle that is greater than 180° is a reflex angle.
an acute angle
Angles less than 90° are referred to as acute angles
Angles that are exactly 90° are called right angles
Angles that are greater than 90° are called obtuse angles
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