there are 4 types of common angles. right, obtuse, acute, and straight.
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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.
obtuse angles are larger than 180 degrees. acute are smaller than 180. for example ina trangle, the exterior angles are obtuse and the inner angles are acute.
A trapezoid contains either:two acute angles and two obtuse angles orone acute angle, one obtuse angle and two right angles.
It can have 0 or 2 right angles, 1 or 2 acute or obtuse angles.