*Contributor: Elephango Editors. Lesson ID: 10619*

Shape up with this lesson! You'll review plane shapes through interactive online and hands-on activities. There is also a worksheet to show your knowledge of shapes.

categories

subject

Math

learning style

Visual

personality style

Lion

Grade Level

Intermediate (3-5)

Lesson Type

Skill Sharpener

Plane figures are flat figures that can be drawn on a surface, such as squares, rectangles, triangles, and circles.

- Were you able find a lot of them in the images above?

Good job!

- Did you know they're made of
*line segments*and can be*closed*or*open*?

Watch the video *Plane Figures| Maths for Kids| Grade 3* by Periwinkle to learn more!

While you're watching, write down your answers to these questions:

- What is a plane?
- What do we call the shapes drawn on a plane?
- What are the 2 types of plane figures?
- How can we tell if a figure is open?
- Is a curve open or closed?
- Is an angle open or closed?
- How can we tell if a figure is closed?
- What is the name of point where 2 sides meet?

Let's practice identifying open and closed figures!

We can classify these figures (sort them into groups) by:

- whether they're open or closed
- the number of sides
- the number of vertices
- whether the side lengths are the same or different

You learned that the place where two sides meet are called *vertices*. (One is a *vertex;* two or more are* vertices.*)

Let's look at some figures, and see how many sides and vertices they have:

**Polygons**

A flat, closed shape, with straight sides, is called a polygon. Many different shapes are polygons. Their sides may be equal, or not.

- Is a circle a polygon?

No. It is flat and closed, but it doesn't have straight sides.

Let's learn more about polygons by watching* Naming Polygons- Maths Tutorials* from missnorledge.

**Rhombus**

A rhombus is a flat shape with 4 equal sides.

- Wait, isn't that what we call a square?

Yes, a square is a rhombus with equal angles. But the angles of a rhombus don't have to be equal.

Here's what a rhombus looks like:

If you said, "Hey, that's a diamond!" you are correct. A diamond shape is a rhombus.

**Trapezoid**

Just one more shape to learn, and that is a trapezoid. A trapezoid is a *quadrilateral.*

- Do you remember what that is?

Yes, it's a 4-sided figure.

A trapezoid's special feature is that it only has one set of parallel sides. The other sides are not parallel.

Wow! You learned a lot about plane figures, and even met some strange figures with funny names.

- Are you ready to practice what you learned?

Great! Move on to the *Got It?* page, where you'll get to draw all these shapes and practice identifying them!

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