# Question: How Many Triangles Are Formed In A 20 Sided Figure?

## How many triangles are there in a 20 sided shape?

The best known is the (convex, non-stellated) regular icosahedron—one of the Platonic solids—whose faces are 20 equilateral triangles..

## Are all 3 sided shapes triangles?

Three-Sided Polygons: Triangles 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. Two of the internal angles are equal. Scalene – all three sides, and all three internal angles, are different.

## Is there a 9 sided shape?

In geometry, a nonagon (/ˈnɒnəɡɒn/) or enneagon (/ˈɛniəɡɒn/) is a nine-sided polygon or 9-gon. The name nonagon is a prefix hybrid formation, from Latin (nonus, “ninth” + gonon), used equivalently, attested already in the 16th century in French nonogone and in English from the 17th century.

## What is a 13 sided shape called?

tridecagonIn geometry, a tridecagon or triskaidecagon or 13-gon is a thirteen-sided polygon.

## What is a 15 sided shape called?

pentadecagonIn geometry, a pentadecagon or pentakaidecagon or 15-gon is a fifteen-sided polygon.

## What is a 25 sided shape called?

pentacosagonlinenumber of sidesname of polygon23icosikaitrigon or tricosagon24icosikaitetragon or tetracosagon25icosikaipentagon or pentacosagon26icosikaihexagon or hexacosagon38 more rows•Apr 6, 2006

## What’s a 20 sided shape called?

icosagonIn geometry, an icosagon or 20-gon is a twenty-sided polygon. The sum of any icosagon’s interior angles is 3240 degrees.

## What is a 50 sided shape called?

pentacontagonIn geometry, a pentacontagon or pentecontagon or 50-gon is a fifty-sided polygon.

## What is a 10 sided shape?

decagonIn 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 30 sided shape called?

triacontagonIn geometry, a triacontagon or 30-gon is a thirty-sided polygon. The sum of any triacontagon’s interior angles is 5040 degrees.

## What is a 27 sided shape called?

heptaSystematic polygon namesOnesTwenties6hexa-267hepta-278octa-289ennea-296 more rows

## What is 12 sided shape called?

dodecagonIn geometry, a dodecagon or 12-gon is any twelve-sided polygon.