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Quadrilaterals

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Quadrilaterals
CCSS.MATH.CONTENT.2.G.A.1

Basics on the topic Quadrilaterals

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In this Quadrilateral Video for 2nd Grade

Nia and Nico bought glow-in-the-dark shapes to stick on the attic ceiling. The directions say to put extra sticky-tac on the quadrilaterals, but what are quadrilaterals? In this quadrilateral shapes video, Nia and Nico learn about quadrilateral properties so they can put them on correctly.

What Is a Quadrilateral?

Let’s learn more about quadrilateral shapes and see quadrilateral examples with the following explanation.

Quadrilateral Definition

A quadrilateral is a special flat, four sided shape. A quadrilateral is also a polygon. The ‘quad’ part of the quadrilateral meaning refers to the number four. So, how many sides does a quadrilateral have? It has four. In order for a shape to meet the definition of quadrilateral, it must have the four properties of a quadrilateral:

  • It must have four straight sides,

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  • Four corners,

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  • Be fully closed,

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  • And be two-dimensional, or flat.

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These are called defining quadrilateral attributes and can never change. They are characteristics that have to stay the same.

However, some quadrilateral characteristics can change and the shape can still be called a quadrilateral.These characteristics are called non-defining attributes. So, quadrilateral polygons can be any color, size, or face in any direction.

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What Does a Quadrilateral Look Like?

A quadrilateral can look like many things. Let’s use an example to see if we can spot what one looks like. Is this a picture of a quadrilateral?

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First, we need to determine if this shape has all four defining attributes of a quadrilateral. It has four straight sides. It has four corners. It is closed and it's two-dimensional. This shape is a quadrilateral because it meets all four defining attributes

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Summary: Quadrilaterals for 2nd Grade

Remember, the definition of a quadrilateral is a shape that must:

  • Have four straight sides,

  • Have four corners,

  • Be fully closed,

  • Be two-dimensional, or flat.

  • However, the size, color, and direction of a quadrilateral can change.

Quadrilateral Properties Worksheets

Have you practiced with pictures of quadrilateral shapes yet? On this website, you can also find examples of quadrilateral shapes, quadrilateral worksheets, and exercises.

Transcript Quadrilaterals

Nico and Nia bought glow-in-the-dark shapes to stick to the attic ceiling! They can't wait to put them up, but first they must read the directions. The directions say to put extra sticky tack on the quadrilaterals, but Nia and Nico don't know what a quadrilateral is! Let's help them by learning about "Quadrilaterals"! Quadrilaterals are special flat, four sided shapes. The ‘quad’ part of the word, quadrilateral, means four. In order for a shape to be called a quadrilateral, four things must always be true: It must have four straight sides, four corners, be fully closed, and be two-dimensional, or flat. These are called defining attributes and can never change, if a shape is to be called a quadrilateral. They are characteristics that have to stay the same. However, some characteristics can change and the shape can still be called a quadrilateral. These characteristics are called non-defining attributes. So, quadrilaterals can be any color, size, or face any direction. Let's use this checklist to see which glow in the dark quadrilaterals we need to put the extra sticky tac on. First, we need to determine if this shape has all four defining attributes of a quadrilateral. It has four straight sides. It has four corners. It is closed and it's two dimensional. This shape IS a quadrilateral because it meets all four defining attributes. Let's put extra sticky tac on it. Take a look at this shape: does it have all four defining attributes of a quadrilateral? It does not have four straight sides, it has ten. This shape does not have four sides so we can stop checking since it can't meet all the requirements. This shape does not need extra sticky tack. Let's look at THIS shape now. Does it meet all four defining attributes of a quadrilateral? It has four straight sides. It has four corners. It is closed and it's two dimensional. This shape IS a quadrilateral because it meets all four of the defining attributes. Let's put extra sticky tack on it. Now, try this shape on your own. Use the checklist to see if the shape meets all four defining attributes. Is this shape a quadrilateral? This shape is not a quadrilateral. While it is closed and its sides are straight, it has more than four sides and more than four corners. It's also not flat, it's three dimensional! So this shape does not get extra sticky tack. While Nico and Nia continue to sort through the other shapes, let's review. Today we learned about quadrilaterals. In order for a shape to be called a quadrilateral, it must have these four defining attributes: four straight sides, four corners, be fully closed and be two-dimensional. However, the size, color, and direction of a quadrilateral can change. "That's the last one Nico, can you hit the lights?" "I think I want to make a wish!"