Pentagon.
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Pentagon.
a 5-sided shape is called a pentagon.
A four sided figure is known as a quadrilateral and its 4 interior angles add up to 360 degrees
A 16-sided figure is known as a hexakaidecagon, 16(sixteen)-gon, or hexadecagon.
A five sided polygon is known as a pentagon. A regular pentagon has five even sides and five internal angles at 108 degrees each.