What Is a 10-Sided Polygon Called?
Last Updated Mar 25, 2020 7:27:34 AM ET
A polygon with 10 sides is called a decagon. The word comes from the Greek words for "ten" ("deka") and for "angle" or "corner" ("gonia"). Decagons have 10 angles and 10 sides.
The five-pointed star on the flag of the United States is actually an irregular decagon, as each of the stars has 10 sides. It is considered irregular because the angles and sides are not equal. A regular decagon, a decagon whose 10 sides are all equal in length, has interior angles that each contain 144 degrees. The exterior angles, or the angles formed by the outside corners of a decagon, each contain 36 degrees.
More From Reference
What Moon Is It This Month? A Year-Round Glossary of Named Moons
Why “The Immortal Life of Henrietta Lacks” Matters in a Post-Pandemic World
Are Purple Sea Urchins Viruses in the Ocean? Why You Should Be Eating More Uni
Greek Mythology Stories: Persephone and the Origin of the Seasons
All About Bunnies: 10+ Facts About Rabbits
What Is the Market Volatility Index, and How Does It Impact Your Investments?