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Q:A:### Quick Answer

**A five-sided shape is called a pentagon.** In geometry, all two dimensional shapes are known as polygons, so it can also be referred to as a five-sided polygon.

There are two types of pentagon; regular and irregular. A regular pentagon has five sides of equal length.

An irregular pentagon has five sides of varying length. A regular pentagon will always have the same interior and exterior angles. The interior angle of a regular pentagon is 108 degrees and the exterior angle of a regular pentagon is 72 degrees. The total interior angles of a pentagon will always equal 540 degrees.

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## How many diagonals does a pentagon have?

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Full Answer >**A pentagon has five diagonals on the inside of the shape.**The diagonals of any polygon can be calculated using the formula n*(n-3)/2, where "n" is the number of sides. In the case of a pentagon, which "n" will be 5, the formula as expected is equal to 5.Filed Under: - Q:
## What is a five-sided polygon called?

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Full Answer >**A pentagon is the name for a five-sided polygon.**However, there are different types of five-sided polygons, such as irregular, regular, concave and convex pentagons.Filed Under: - Q:
## What is a 7-sided polygon called?

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Full Answer >**A polygon with seven sides is called a heptagon.**A polygon is a closed geometric shape that has at least three sides and angles.Filed Under: - Q:
## 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: