A regular pentagon has 5 equal sides and 5 equal interior obtuse angles of 108 degrees.
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A pentagon has an obtuse angle
obtuse angle
Not sure what the question means. A triangle or quadrilateral may but need not contain an obtuse angle. A pentagon or any polygon with more sides must contain at least one obtuse angle.
An irregular pentagon.An irregular pentagon.An irregular pentagon.An irregular pentagon.
A pentagon.