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# Polygons review

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?

## Identifying polygons

Polygons can be named by their number of sides.
Number of sidesName
3Triangle
5Pentagon
6Hexagon
7Heptagon
8Octagon

### Practice set 2

Problem 2A
• Current
Which of these shapes are quadrilaterals?

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

## Want to join the conversation?

• 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
• What's a polygon
• 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.
• 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!
• What are the names for the polygons above octagon?
• 9--Nonagon
10--Decagon
11--Hendecagon
12--Dodecagon
• 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 is a 30 sided shape called ?
• Thank you, I never knew that a 30 sided shape was called a triacontagon.