How Many Sides in a Decagon?

In geometry, a decagon (from the Greek δέκα déka and γωνία gonía, "ten angles") is a ten-sided polygon or 10-gon. The total sum of the interior angles of a simple decagon is 1440°. A self-intersecting regular decagon is known as a decagram.

What is a 100 sided shape called?

In case of two dimensional shapes, a shape with 100 sides is called Hectogon. For instance, "icosi" is the tens digit, which means "20." A quadrilateral is a four-sided polygon with four angles.

What is a 12 sided shape called?

A dodecagon is a 12-sided polygon. Several special types of dodecagons are illustrated above. In particular, a dodecagon with vertices equally spaced around a circle and with all sides the same length is a regular polygon known as a regular dodecagon.

James H. Sterling

James H. Sterling

Environmental Science & Climate Journalist

James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.