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## 5th grade

### Unit 16: Lesson 3

Properties of shapes# Polygons review

CCSS.Math:

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

*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

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

## Want to join the conversation?

- What is the difference Between a Circle, Ellipse And an oval .(7 votes)
- Well, a circle is identical all around it, an ellipse changes due to it's diameter, and an oval, similar to an ellipse, is never identical all around. Hope this helps!(2 votes)

- What's a polygon(0 votes)
- 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.(2 votes)

- Actually does anyone know the name of a 20-sided shape?(4 votes)
- A 20 - sided shape is called a icosagon. To learn about other shapes with a lot of sides go to:
*https://sngweb.com/education/formula/geometry/polygon_name.html*(0 votes)

- Is Nonagon Belong In A Polygon?(5 votes)
- Yes a nonagon is a polygon, one with nine sides and angles.(4 votes)

- 3 dimensional octagon is called a octahedron(7 votes)
- A three dimensional octagon is a octagonal prism. An octahedron is a square pyramid stacked on top of another one, and it has 8 sides.(3 votes)

- what would a ten sided shape be called?(2 votes)
- Decagon. In geometry, a decagon is a ten-sided polygon or 10-gon(3 votes)

- What is a 24-sided shape called?(0 votes)
- it is a 24-gon because a shape with more than 10 sides is named as its sides.(3 votes)

- What is a fifty sided shape called?(4 votes)
- if it is not closed then it isnt a polygon, right?(3 votes)
- is there a shape that has 11 sides?(4 votes)
- yes there is hendagon!(1 vote)