An octagon is a flat shape with 8 straight sides and 8 corners. It has 8 straight sides and 8 corners. Below you will find its properties, how to draw it, where to spot it in real life, and a quick quiz.

A bright octagon for little learners to explore!
| Sides | 8 straight sides |
|---|---|
| Corners (vertices) | 8 |
| Angles | Each angle is 135 degrees in a regular octagon (1,080 degrees in total) |
| Lines of symmetry | 8 (in a regular octagon) |
| Flat or solid | Flat (2D) |
An octagon has 8 straight sides and 8 corners. 'Octo' means eight, the same as in octopus. In a regular octagon, all the sides are the same length and each inside corner measures 135 degrees. If you cut the 4 corners off a square, you get an octagon.
You can spot the octagon shape in everyday life, like a stop sign, an umbrella top, and a gazebo. Try going on a shape hunt around your house or classroom — how many octagons can you find today?
An octagon can look like a circle from far away. Count the straight sides: an octagon has 8, and a circle has none.
Answer each question, then tap it to check.
Eight.
The stop sign.
The octopus.
Practice on paper with the Shapes Tracing and Coloring worksheet and the Shapes Activity worksheet, or play the Shapes Match game.
Send children on a hunt for octagon shapes — a stop sign picture, an umbrella top, a gazebo — and gather the finds on a table. Then play a matching game: draw several shapes on cards and have kids sort out only the octagons.
Cut the 4 corners off a paper square to reveal an 8-sided octagon, then count the sides together. It's a satisfying hands-on way to connect a familiar shape to a new one.
Talk about why stop signs are octagons — their unique 8-sided shape is easy to recognize from any angle, even from behind or through snow, which helps keep drivers and pedestrians safe.
An octagon has 8 straight sides.
An octagon has 8 corners.
8 (in a regular octagon).
Draw a square lightly in pencil. Cut off each corner of the square with a short slanted line. Rub out the corners you cut off. You now have 8 sides.
An octagon can look like a circle from far away. Count the straight sides: an octagon has 8, and a circle has none.
An octagon is a flat shape with 8 straight sides and 8 corners. Remember: 8 straight sides, 8 corners. Next, learn about the crescent, or see all shapes.