This question is rather vague, please consider revising it. But here are a couple ways:
They are alike in that they are both less than 180°.
They are both greater than 0°.
They are both angles.
Any two angles formed by a line at any angle crossing another line, one acute and one obtuse, will add up to 180°.
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They are both angles.....acute is smaller than ninety degrees and obtuse is larger/wider. They aren't alike in a lot of ways though.
They are both either bigger or smaller than a right angle
acute and obtuse.
They make a pair of acute angles and a pair of obtuse angles. In rotational order, the angles are acute, obtuse, acute, obtuse.
there are 4 types of common angles. right, obtuse, acute, and straight.