# What Is The Sum Of A 12 Sided Polygon?

Dodecahedrons Have 12 Pentagonal Faces

Dodecahedrons (pronounced dow·deh·kuh·hee·druhns) are three-dimensional bodies containing a dozen flat faces — all shaped like pentagons.

## How do you find the interior angle of a polygon with 12 sides?

The total interior angle of a 12 sided polygon is = (12 – 2) 180 degrees = 1800 degrees. The internal angle at each vertex of an regular dodecagon is equal to = = 150 degrees. … The total exterior angle of a 12 sided polygon is 360 degrees.

## What’s a 13 sided shape called?

A 13-sided polygon, sometimes also called the triskaidecagon.

### What is 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.

### What is a 10 sided shape?

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°.

### What is a 3d 12 sided shape called?

In geometry, a dodecahedron (Greek δωδεκάεδρον, from δώδεκα dōdeka “twelve” + ἕδρα hédra “base”, “seat” or “face”) or duodecahedron is any polyhedron with twelve flat faces. The most familiar dodecahedron is the regular dodecahedron with regular pentagons as faces, which is a Platonic solid.

### What is 11 sided polygon called?

In geometry, a hendecagon (also undecagon or endecagon) or 11-gon is an eleven-sided polygon.

### What is a 7 sided shape called?

A heptagon is a seven-sided polygon. It is also sometimes called a septagon, though this usage mixes a Latin prefix sept- (derived from septua-, meaning “seven”) with the Greek suffix -gon (from gonia, meaning “angle”), and is therefore not recommended.

### What’s a 9 sided shape?

A nine sided shape is a polygon called a nonagon. It has nine straight sides that meet at nine corners. The word nonagon comes from the Latin word “nona”, meaning nine, and “gon”, meaning sides.

### How many sides does a polygon have if each interior angle is 150?

Its interior angle has measure 150∘. Therefore, the exterior angle has measure 180∘−150∘=30∘. Therefore, the number of sides of the regular polygon with interior angle 150∘ is 12.

### What is a 14 sided polygon called?

In geometry, a tetradecagon or tetrakaidecagon or 14-gon is a fourteen-sided polygon.

### What is a 4 sided shape called?

Definition: A quadrilateral is a polygon with 4 sides. A diagonal of a quadrilat- eral is a line segment whose end-points are opposite vertices of the quadrilateral.

### Is any 3 sided polygon a triangle?

A three-sided polygon is a triangle.

There are several different types of triangle (see diagram), including: Equilateral – all the sides are equal lengths, and all the internal angles are 60°. Isosceles – has two equal sides, with the third one a different length.