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# What is a 5-sided polygon?

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### Quick Answer

A five-sided polygon is called a pentagon. A pentagon also has five vertices and five interior angles, which add up to a total of 540 degrees.

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The perimeter of a pentagon is calculated by adding the length of all the sides together. A regular pentagon has all sides of equal length and all interior angles measuring 108 degrees. A regular pentagon is able to be divided into five regular triangles. Finding the area of one of the triangles and multiplying it by five yields the area of the regular pentagon. A real-life example of this five-sided figure is the Pentagon in Arlington, Va., located right outside of Washington, D.C. This five-sided building houses the U.S. Department of Defense.

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Q:
## What is a seven-sided shape called?

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Full Answer >**A seven-sided shape is called a heptagon.**A heptagon is one type of polygon, which can have any number of sides.Filed Under: -
Q:
## What is a 12-sided shape called?

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Full Answer >**A 12-sided shape is called a dodecagon.**A dodecagon is a type of polygon, which is a two-dimensional shape comprised of straight lines. These lines connect to each other to form a closed shape.Filed Under: -
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## What is a nine-sided polygon called?

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Full Answer >**A nine-sided polygon is called a nonagon.**The prefix "non" is derived from the Latin "nonus," which means "ninth" to allude to the nine sides and angles of the polygon.Filed Under: -
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## What is an 8-sided polygon called?

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Full Answer >**An 8-sided polygon is called an octagon.**One common use of the octagon is in the iconic red stop sign that's used throughout the United States.Filed Under: