An obtuse angle.
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If all sides have equal length (i.e. if it is a regular pentagon), then each (interior) angle has 108 degrees, for a total of 5*(108 degrees) = 540 degrees.
108°f=136.8°c
A plane shape with five sides of equal length, and five equal angles: each of 108 degrees.
A regular pentagon has 5 equal sides and 5 equal interior angles each measuring 108 degrees
A circle.