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Geometry for Kids6 chapters | 45 lessons

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Lesson Transcript

Instructor:
*Jennifer Lowery*

Jennifer has taught elementary levels K-3 and has master's degrees in elementary education and curriculum/instruction and educational leadership.

You've learned about different types of shapes, but do you know about quadrilaterals? In this lesson, explore the definition of a quadrilateral and find out about many familiar and new types of quadrilaterals!

How many quarters are in one dollar? How many quarts are in one gallon? Both questions have the same answer: four. Now do you notice something similar in the words ''quarter'' and ''quart''? They both have the same base word, *quart*, and so does the word quadrilateral. What is a quadrilateral? By now you can probably guess it has something to do with the number 4!

A **quadrilateral** is a flat, two-dimensional shape that has four sides and four corners, or vertices. **Vertices** is plural for ''vertex.'' You probably already know some common quadrilaterals. Squares and rectangles, for instance, both have four sides and four vertices. Let's learn about some other examples and find out about their characteristics.

A trapezoid is a type of quadrilateral that is seen less frequently, although you'll notice them in everyday life if you look carefully! This shape has one set of sides that are **parallel**, which means that those sides are always an equal distance apart, no matter how far you stretch them. An easy way to remember this is that the l's in ''parallel'' are actually parallel! The other two sides of the trapezoid are intersecting, which means if they're stretched out, they will eventually cross over each other.

Another type of quadrilateral is a parallelogram. The word might be a tongue twister, but now that you know what ''parallel'' means, you'll understand the characteristics of a parallelogram. In this quadrilateral, there are two sets of parallel lines. Keep in mind that there are actually several shapes that can be considered a parallelogram. Some types of parallelograms, for example, look like rectangles that got blown to the side in a windstorm!

A rhombus is a type of shape that is both a quadrilateral and a parallelogram! Many people would look at this shape and say it is a diamond. But the correct geometry term is ''rhombus,'' and it is a quadrilateral that has two sets of parallel sides. All sides of a rhombus are the same length.

Have you ever flown a kite? If so, it may have been a quadrilateral! In geometry, a kite shape has four sides and four vertices, so it follows the rules of being a quadrilateral. It looks different from others, however, because it has two short sides that are connected at the top and two long sides that are connected at the bottom.

You now know that the kite you fly on a windy day could be a quadrilateral. Now look around the room you're sitting in. What other quadrilaterals can you find? If you're looking at a computer screen, chances are it's a rectangle! Windows, cabinets, and some street signs can all be examples of quadrilaterals. Play a game with a friend and see who can find the most quadrilaterals in one minute. You'll be amazed at how many you can find!

**Quadrilaterals** are shapes with four sides and four corners, or **vertices**, and often two of the sides are **parallel**, which means they're always the same distance apart no matter how long they stretch. More common quadrilaterals are squares and rectangles, but there are also trapezoids, parallelograms, and kites. Take a look around you and you'll find quadrilaterals everywhere, including some street signs and furnishings.

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Geometry for Kids6 chapters | 45 lessons

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