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Geometry for Kids6 chapters | 45 lessons

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Lesson Transcript

Instructor:
*Kadoria Burgess*

I have a Bachelor's degree in Elementary Education and Spanish. I have taught for 5 years in bilingual classrooms of various elementary grade levels.

Stop signs, Dorito's, a sheet of paper, and a paper plate. What do all of these have in common? They are examples of plane shapes, and in this lesson, you'll learn how to find plane shapes everywhere!

When you think of plane shapes, you might think of a big jet flying in the sky, but plane shapes didn't get their name because they fly. They're called **plane shapes** because they're figures that are flat and closed. That's right! Plane shapes don't pop up or out at you. Instead, plane shapes are what you would see in a drawing or a cartoon, but remember they cannot have any gaps or parts that are open. Sometimes, you may even hear them being called two-dimensional or 2-D shapes. This means that you cannot touch them on all sides like a ball or a block.

Plane shapes can include **sides**, which are straight lines that make up the shape, and **corners**, which are where two sides come together. Some examples of plane shapes that you may see every day are stop signs, a sheet of paper, a paper plate, a stamp, or even a tortilla chip. There are many kinds of plane shapes, but we will focus on 5 basic kinds: squares, rectangles, circles, triangles, and octagons.

A plane shape that has four sides that are all the same length and has four right angles for corners is called a square. You can see squares in checkerboards, the keys of your keyboard, the side of a Rubik's cube, or in your kitchen tiles. Any time a four-sided shape has equal sides and right angles for corners, that's a square.

A plane shape with four straight sides and four right angles for corners is called a rectangle. The difference between a square and a rectangle is that a rectangle's sides don't have to be the same length. A piece of paper has two long sides and two short sides, so it's a rectangle.

Think of the paper plate. The paper plate does not have any corners or even any actual sides because it continues to go around and around. This is because the paper plate is a circle. A circle is a plane shape that has no sides and no corners because it is perfectly round.

Have you ever eaten a Dorito or a tortilla chip? Doritos are an example of a triangle. A triangle is a shape with three sides and three corners. The sides can be any length as long as there are three.

Stop signs are everywhere, and they help make sure that we are safe. This means that there are octagons everywhere. Octagons are plane shapes that have eight sides and eight corners.

A **plane shape** is a flat or two-dimensional shape that is closed. The straight lines that make up the shape are the **sides**, where the parts where two sides come together are the **corners**. A square has four sides and four corners that are all the same, while a rectangle also has four sides and four corners, but two sides are long and two sides are short. A circle has no sides or corners because it's perfectly round; a triangle has three sides and three corners; and an octagon has eight sides and eight corners.

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21 in chapter 3 of the course:

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Geometry for Kids6 chapters | 45 lessons

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- What is an Apex in Math?
- What is Asymmetry in Math? - Definition & Examples
- What is the Center of Rotation?
- How to Find the Center of Rotation
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- Volume of a Hemisphere
- What is a Hemisphere in Math? - Definition & Example 2:49
- Surface Area of a Hemisphere
- What is a Hexahedron?
- What is an Icosahedron? - Definition & Facts
- Major & Minor Arcs of a Circle
- Surface Area & Volume of an Octahedron
- What is the Order of Rotational Symmetry?
- What is an Oval? - Definition & Shapes 2:37
- Parallelogram Lesson for Kids
- What are Plane Shapes? - Definition & Examples 3:09
- What is a Quadrangle? - Definition & Shapes 3:22
- Quadrilateral Lesson for Kids: Definition & Shapes
- Rhombus Lesson for Kids: Definition & Facts
- Go to Shapes in Geometry for Elementary School

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