Every triangle must have at least 2 of them,
and many triangles have 3 of them.
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A null angle and an acute angle are less than a right angle.
An acute angle
An acute angle.
acute angles are smaller versions of obtuse angles got it? These are angles that greater than 0 degrees and less than 90 degrees. An angle that is 90 degrees is called a "right angle". Any angle that is greater than 90 degrees and less than 180 degrees is called an "obtuse angle". Any angle that is 180 degrees is called a "straight angle"
An angle greater than 90 but less than 180 degrees is obtuse An angle greater than 0 but less than 90 degrees is acute A right angle measures 90 degrees