I have learned about Geometry basic here, then I want to curious how many polygons or shape in the world at all ? only till to 8 (Octagon) or is there more polygons ?

There are many more! 9 sides? Nonagon, 10 sides? Decagon. And so on and so on until there are so many sides you could hardly tell the difference between them and circles.

What is a 24-sided shape called?

A icositetragon An icosogon is 20 sides, and tetra means 4. Put them together and you get 24

A polygon is made of any three straight sides with the lines all connected to each other, as well as not overlapping and meeting at the ends of the lines.

what would be a 20 side shape be called

A 20-sided shape is known as an icosahedron.

why does every shape have gon at the end, like hexagon or a pentagon ect.

-Gon is a suffix for a shape that has a specific number of angles.

What are the names for the polygons above octagon?

9--Nonagon 10--Decagon 11--Hendecagon 12--Dodecagon

What is a 30 sided shape called ?

Thank you, I never knew that a 30 sided shape was called a triacontagon.

What is the difference Between a Circle, Ellipse And an oval .

The difference is; with a circle the diameter IS THE SAME all the way around, but with a ellipse the diameter CAN CHANGE as you go around, so a circle is a ellipse but an ellipse is not always a circle. Hope this helps!

Who invented the word polygon?

The Greeks invented the word "polygon" probably used by the Greeks well before Euclid wrote one of the primary books on geometry around 300 B.C. "polygon" has been used in English since around 1560 The word comes from two parts: "poly-" = many "-gon" = angle (or knee)

Main content

Polygons review

CCSS.Math:

5.G.B.3

Google Classroom

Review the term polygon and name polygons with up to 8 sides. Then, try some practice problems.

What is a polygon?

A polygon is a closed figure with at least 3 straight sides.

Practice set 1

Problem 1A

Current

Is the following figure a polygon?

Want to learn more about recognizing shapes? Check out this video.

Identifying polygons

Polygons can be named by their number of sides.

Number of sides	Name
3	Triangle
4	Quadrilateral
5	Pentagon
6	Hexagon
7	Heptagon
8	Octagon

Practice set 2

Problem 2A

Current

Which of these shapes are quadrilaterals?

Want to try more problems like this? Check out this exercise

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abdan syakuran
Posted 5 years ago. Direct link to abdan syakuran's post “I have learned about Geom...”
I have learned about Geometry basic here, then I want to curious how many polygons or shape in the world at all ? only till to 8 (Octagon) or is there more polygons ?
Button navigates to signup pageComment on abdan syakuran's post “I have learned about Geom...”
(48 votes)
Answer
- grayson.lee
  Posted 5 years ago. Direct link to grayson.lee's post “There are many more! 9 si...”
  There are many more! 9 sides? Nonagon, 10 sides? Decagon. And so on and so on until there are so many sides you could hardly tell the difference between them and circles.
  Comment on grayson.lee's post “There are many more! 9 si...”
  (50 votes)
ULTIMATEGUYZ
Posted 5 years ago. Direct link to ULTIMATEGUYZ's post “What is a 24-sided shape ...”
What is a 24-sided shape called?
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(20 votes)
Answer
- Hecretary Bird
  Posted 5 years ago. Direct link to Hecretary Bird's post “A icositetragon An icosog...”
  A icositetragon
  An icosogon is 20 sides, and tetra means 4.
  Put them together and you get 24
  Comment on Hecretary Bird's post “A icositetragon An icosog...”
  (29 votes)
bh4troy
Posted 6 years ago. Direct link to bh4troy's post “What's a polygon”
What's a polygon
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(18 votes)
Answer
- Tgeneral2001
  Posted 6 years ago. Direct link to Tgeneral2001's post “A polygon is made of any ...”
  A polygon is made of any three straight sides with the lines all connected to each other, as well as not overlapping and meeting at the ends of the lines.
  Comment on Tgeneral2001's post “A polygon is made of any ...”
  (18 votes)
xd SevaCool
Posted 5 years ago. Direct link to xd SevaCool's post “what would be a 20 side s...”
what would be a 20 side shape be called
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(12 votes)
Answer
- Roger McCarter
  Posted 5 years ago. Direct link to Roger McCarter's post “A 20-sided shape is known...”
  A 20-sided shape is known as an icosahedron.
  Comment on Roger McCarter's post “A 20-sided shape is known...”
  (12 votes)
Faaty
Posted 5 years ago. Direct link to Faaty's post “What is the difference Be...”
What is the difference Between a Circle, Ellipse And an oval .
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(7 votes)
Answer
- GoPro47😃
  Posted 5 years ago. Direct link to GoPro47😃's post “The difference is; with a...”
  The difference is; with a circle the diameter IS THE SAME all the way around, but with a ellipse the diameter CAN CHANGE as you go around, so a circle is a ellipse but an ellipse is not always a circle. Hope this helps!
  Button navigates to signup page
  (23 votes)
Khalid
Posted 5 years ago. Direct link to Khalid's post “What are the names for th...”
What are the names for the polygons above octagon?
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(10 votes)
Answer
- Lewis
  Posted 5 years ago. Direct link to Lewis's post “9--Nonagon 10--Decagon 1...”
  9--Nonagon
  10--Decagon
  11--Hendecagon
  12--Dodecagon
  Comment on Lewis's post “9--Nonagon 10--Decagon 1...”
  (14 votes)
bbiekert
Posted 6 years ago. Direct link to bbiekert's post “why does every shape have...”
why does every shape have gon at the end, like hexagon or a pentagon ect.
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(11 votes)
Answer
- Veronica Viticella
  Posted 6 years ago. Direct link to Veronica Viticella's post “-Gon is a suffix for a sh...”
  -Gon is a suffix for a shape that has a specific number of angles.
  Comment on Veronica Viticella's post “-Gon is a suffix for a sh...”
  (12 votes)
LEARNÁ📕📗📘
Posted 5 years ago. Direct link to LEARNÁ📕📗📘's post “What is a 30 sided shape ...”
What is a 30 sided shape called ?
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(10 votes)
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- Tatva Kabat
  Posted 5 years ago. Direct link to Tatva Kabat's post “Thank you, I never knew t...”
  Thank you, I never knew that a 30 sided shape was called a triacontagon.
  Comment on Tatva Kabat's post “Thank you, I never knew t...”
  (3 votes)
Rosie YANG
Posted 5 years ago. Direct link to Rosie YANG's post “Who invented the word pol...”
Who invented the word polygon?
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(7 votes)
Answer
- davebetts
  Posted 5 years ago. Direct link to davebetts's post “The Greeks invented the w...”
  The Greeks invented the word "polygon" probably used by the Greeks well before Euclid wrote one of the primary books on geometry around 300 B.C.
  
  "polygon" has been used in English since around 1560
  
  The word comes from two parts:
  "poly-" = many
  "-gon" = angle (or knee)
  Comment on davebetts's post “The Greeks invented the w...”
  (11 votes)
Trixie Tang
Posted 6 years ago. Direct link to Trixie Tang's post “Actually does anyone know...”
Actually does anyone know the name of a 20-sided shape?
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4th grade (Eureka Math/EngageNY)

Course: 4th grade (Eureka Math/EngageNY) > Unit 4