What is a polygon? The word polygon is Greek and means "many" (poly) and "angle'" (gon). A polygon is a two dimensional (2D) shape that is formed by straight lines. Polygons can be many-sided and students can experiment with making irregular polygons with a variety of sides.

## Name the Polygons Worksheet

Regular polygons occur when angles are equal and the sides are the same length. This is not true for irregular triangles. Therefore, examples of polygons include rectangles, squares, quadrilaterals, triangles, hexagons, pentagons, and decagons, to name a few.

## Find the Perimeter Worksheet

Polygons are also categorized by their number of sides and corners. A triangle is a polygon with three sides and three corners. A square is a polygon with four equal sides and four corners. Polygons are also classified by their angles. Knowing this, would you classify a circle as a polygon? The answer is no. However, when asking students if a circle is a polygon, always follow up with a why. A student should be able to state that a circle doesn't have sides, which means it can't be a polygon.

## Properties of Polygons

A polygon is also a closed figure, which means a two-dimensional shape that looks like a U could not be a polygon. Once children understand what a polygon is, they will then move on to classify polygons by their number of sides, angle types, and visual shape, which is sometimes referred to as properties of polygons.

For these worksheets, it would be helpful for students to recognize what the polygon is and then to describe it as an additional challenge.