*Rodney Davis*Show bio

Rodney has 9 years of elementary teaching experience and a Master of Arts degree in Early Childhood Education.

Instructor:
*Rodney Davis*
Show bio

Rodney has 9 years of elementary teaching experience and a Master of Arts degree in Early Childhood Education.

In this lesson, we'll discuss the mathematical term called polygons. You'll learn how to identify and classify polygons, as well as discover the names and types of several polygons.

You're playing video games with your friend when he notices your controller has square buttons instead of letters. Not noticing this before you just shrug and continue to play. However, after he leaves, you start to notice your room is full of shapes and lots of them are similar to the one on your controller. Shapes are everywhere, and many shapes are polygons.

**Polygons** are closed shapes with three or more sides. A polygon must always be closed and cannot have any curves. The place where the lines on a polygon meet are called an angle. There are many different types of polygons, and they can be grouped by their characteristics or their appearance.

Some of the most common shapes are polygons. Rectangles, triangles, and squares are all polygons because they have at least three sides, with no curves, and are completely closed. All of these are also an example of regular polygons. **Regular polygons** have sides that are the same length and their angles have the same measurement. More examples of regular polygons would include pentagons, hexagons, and octagons.

An **irregular polygon** has sides that are different in length and their angles have different measurements. An example of an irregular polygon would be a trapezoid. Trapezoids has four sides like squares and rectangles but usually only two sides are equal in length.

Polygons are classified, or divided, into groups as either as convex or concave. A convex polygon has all of the angles pointing outward. All of the angles of convex polygons measure less than 180 degrees. Most of the polygons you'll see are convex polygons. A pentagon would be an excellent example of a convex polygon.

However, in some cases, you'll see a concave polygon. A concave polygon has at least one of its angles pointing towards the center. A star would be an example of a concave polygon. To be a concave polygon, one or more of the angles must measure greater than 180 degrees.

**Polygons** are close figures or shapes with three or more sides with no curves. Polygons are grouped as a regular or irregular polygon and convex or concave polygon. **Regular polygons** have sides that are all the same and angles have the same measurements, while **irregular polygons** sides have different lengths and angles may have different measurements. Convex polygons have angles that point outward, while concave polygons have at least one angle that points towards the center, like a star.

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