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Geometry for Kids6 chapters | 45 lessons

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Lesson Transcript

Instructor:
*Rayna Cummings*

Rayna has taught Elementary Education for 12 years (in both 1st, 2nd, and 3rd grades) and holds a M.Ed in Early Childhood Education from The Ohio State University

Plane shapes are all around us, but how do we know what shapes are plane shapes? In this lesson, you will learn what plane shapes are and explore their different types and properties.

**Plane shapes** in mathematics are any closed, flat, 2-dimensional shapes. Let's take a look at some shapes:

As you can see, the plane shapes in the top row include a triangle, rectangle, diamond, and star. The plane shapes in the bottom row include a pentagon (or a 5-sided shape), circle, and square.

Now take a minute to see if you can find some shapes around your house that are plane shapes. These might include a clock, dinner plate, piece of paper, or rug.

Did you know there are different types of plane shapes? For instance, many plane shapes are **polygons**, or any 2-dimensional shape with straight sides or lines that is closed and has no open sides. Let's go back and take another look at the image of the plane shapes and see if any of these shapes are polygons.

That's right; the triangle, rectangle, diamond, star, pentagon, and square are all polygons.

Another type of plane shape is known as a **quadrilateral**, or a 2-dimensional shape with 4 straight sides that is closed and has no open sides. Let's look at some examples of quadrilaterals:

As you can see, some plane shapes are both polygons and quadrilaterals.

Now see if you can find any quadrilaterals around your house. For example, a photo, a square tile on your kitchen floor, or a place mat on your table would all be considered quadrilaterals.

Plane shapes have properties including sides, corners, and faces. Do you see any of these properties in this image of a rectangle?

The easiest way to find the properties of a shape is to think about it sides first, then its corners, and finally its flat surface, or face. For example, a rectangle has the following properties:

- 4 sides
- 4 corners
- 1 rectangular face

Now go back to the picture at the beginning of the lesson and see if you can figure out the properties of these plane shapes: square, triangle, circle, pentagon, diamond, and star.

You should have found that:

- A square has 4 sides, 4 corners, and a square face.
- A triangle has 3 sides, 3 corners, and a triangle face.
- A circle has 0 sides, 0 corners, and a circular face.
- A pentagon has 5 sides, 5 corners, and a pentagon face.
- A diamond has 4 sides, 4 corners, and a diamond face.
- A star has 10 sides, 10 corners, and a star face.

In this lesson, you learned that a **plane shape** is any closed, flat, 2-dimensional shape. You also learned there are different types of plane shapes, such as **polygons** (2-dimensional shapes with straight lines and no open sides) and **quadrilaterals** (2-dimensional shapes with 4 straight sides and no open sides). Lastly you learned that each plane shape has properties, such as sides, corners, and faces.

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Geometry for Kids6 chapters | 45 lessons

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