Ron was asked to make shapes out of matchsticks.
The first shape he made looked like this.
The second shape looked like this.
The first shape is closed, while the second one is open.
Let's look at this square.
Trace its sides starting at the upper left side.
You end up at the same point you started from.
Shapes that start and end at the same point, and that have no open ends, are called closed shapes.
The space inside a closed shape is called its interior.
Shapes such as squares, triangles, circles, and pentagons are all closed shapes.
Here are some things that are closed shapes.
Can you spot some closed shapes around you?
Now, let's look at this shape.
Trace this shape with your finger, starting at the upper right side.
Where does the shape end?
The shape ends at a different point altogether.
Shapes that start and end at different points are called open shapes.
Open shapes have no interior.
Some examples of open shapes are shown below.
These are open shapes that you may see around you.
Can you spot other open shapes in your home?
Great work learning about open and closed shapes. 👏
Now, start the practice. It's fun.