A regular 5 sided pentagon has exterior acute angles and interior obtuse angles each of 72 degrees and 108 degrees respectively
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acute angles are angles that are smaller than 90 degrees. all acute angles are all angles that are less than 90degrees
There are three acute angles in an acute triangle and they add up to 180 degrees.
In every pair of complementary angles, both of them are acute angles.
Acute angles of angles that have a magnitude less than 90 degrees.